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American Institute of Physics |
Documentos disponibles de esta editorial (326)
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Hishiyama, N. ; Hoshino, M. ; Blanco Ramos, Francisco ; García, G. ; Tanaka, H. | American Institute of Physics | 2018-02-28As a sequel paper to our study of the elastic scattering for electron collisions with phosphorus trifluoride, PF? molecules, we report absolute inelastic differential and integral cross sections (DCS and ICS) of vibrational excitations for the c[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Malyshev, Andrey ; Rodriguez, A. | American Institute of Physics | 2000-02-08We present results of numerical simulations of optical absorption line shape of Frenkel excitons in two-dimensional disordered lattices. Disorder is generated by Gaussian randomness in the molecular positions. The intersite interaction is consid[...]texto impreso
In this work, the ac admittance of a thick film nickel manganate spinel negative temperature coefficient thermistor ceramic system containing a glass phase is investigated. The dominating relaxation process is a grain boundary (GB) effect and ha[...]texto impreso
The dispersionless KP hierarchy is considered from the point of view of the twistor formalism. A set of explicit additional symmetries is characterized and its action on the solutions of the twistor equations is studied. A method for dealing wit[...]texto impreso
Balcells, Ll. ; Beltrán Finez, Juan Ignacio ; Martínez-Boubeta, C. ; Konstantinovi?, Z. ; Arbiol, J. ; Martínez, B. | American Institute of Physics | 2010-12-20In this work we report on the magnetic behavior of MgO thin films prepared by sputtering. A severe aging process of the ferromagnetic properties is detected in magnetic samples exposed to ambient atmosphere. However, ferromagnetism can be succes[...]texto impreso
AK Sco is a unique source: a 10-30 Myrs old pre-main sequence spectroscopic binary composed by two nearly equal F5 stars that at periastron are separated by barely eleven stellar radii so, the stellar magnetospheres fill the Roche lobe at perias[...]texto impreso
Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2009-03-01Al doped ZnO arrays of nanoplates and of ordered nanoneedles have been grown by a thermal evaporation-deposition method. The nanoplates, which have mainly triangular shape. Interpenetrating triangles and crossing of the triangles with other plan[...]texto impreso
Through fractional calculus and following the method used by Dirac to obtain his well-known equation from the Klein-Gordon equation, we analyze a possible interpolation between the Dirac and the diffusion equations in one space dimension. We stu[...]texto impreso
Höft, Nicolas ; Horbach, Jürgen ; Martín Mayor, Víctor ; Seoane, Beatriz | American Institute of Physics | 2017-08-28We present a three-dimensional Ising model where lines of equal spins are frozen such that they form an ordered framework structure. The frame spins impose an external field on the rest of the spins (active spins). We demonstrate that this “poro[...]texto impreso
We analyze the band structure and interband optical transitions in a dangling backbone ladder DNA model. Using this model, semiconducting synthetic poly(G)- poly(C) DNA is studied by means of a tight-binding model traditionally used for transpor[...]texto impreso
Jaque, D. ; González Herrera, Elvira María ; Martín, J. I. ; Anguita,, J. V. ; Vicent López, José Luis | American Institute of Physics | 2002-10-07Arrays of submicrometric Ni lines have been fabricated in superconducting Nb films by electron beam lithography. In the mixed state, these arrays induce strong anisotropy in the dissipation behavior. The dissipation is reduced several orders of [...]texto impreso
Marín Palacios, Pilar ; Aragon, A.M ; Lieblich, M. ; Garcia Escorial, A. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio | American Institute of Physics | 2012-07Magnetization curves of mixed Nb and FeSi based micrometric particles have been analyzed. The influence of the dispersion of Nb particles on the mixture remanence and coercivity has been studied above and below the Nb superconducting critical t[...]texto impreso
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Brandao Fischer, Bruno ; Cubitt, Toby S. ; Lucia, Ángelo ; Michalakis, Spyridon ; Pérez García, David | American Institute of Physics | 2015We prove an area law with a logarithmic correction for the mutual information for fixed points of local dissipative quantum system satisfying a rapid mixing condition, under either of the following assumptions: the fixed point is pure or the sys[...]texto impreso
González Herrera, Elvira María ; Villegas, J. E. ; Varela del Arco, María ; Santamaría Sánchez-Barriga, Jacobo ; Prieto, P. ; Schuller, Ivan K. ; Vicent López, José Luis | American Institute of Physics | 2002-05-27Bi_2Sr_2CaCu_2O_8, RBa_2Cu_3O_7 (R=Y, Eu) thin films and RBa_2Cu_3O_7/PrBa_2Cu_3O_7 superlattices have been fabricated by sputtering technique. The anisotropic dissipation was measured close to the critical temperatures with high applied magneti[...]texto impreso
We show that vector theories on cosmological scales are excellent candidates for dark energy. We consider two different examples, both are theories with no dimensional parameters nor potential terms, with natural initial conditions in the early [...]texto impreso
Martínez, José I. ; Abad, Enrique ; Beltrán Finez, Juan Ignacio ; Flores, Fernando | American Institute of Physics | 2013-12-07The interface between the tetrathiafulvalene/tetracyanoquinodimethane (TTF-TCNQ) organic blend and the Au(111) metal surface is analyzed by Density Functional Theory calculations, including the effect of the charging energies on the molecule tra[...]texto impreso
Herrero Gómez, Carlos ; Marín Palacios, Pilar ; Hernando Grande, Antonio | American Institute of Physics | 2013-09-30In the present paper, we report a systematic study of the magnetoelastic resonance of amorphous magnetic microwires of composition Fe73Si11B13Nb3. The study was performed for samples annealed at different temperatures. It was observed that such [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2003-12-15The composition, bonding configuration, hydrogen content, and paramagnetic defects of SiOxHy thin films were studied. Films were deposited by the electron cyclotron resonance plasma method at room temperature using SiH4 and O-2 as precursor gase[...]texto impreso
The electromagnetic self?interaction of a bound classical nonlinear Dirac field in a Coulomb potential is studied. It is shown that by a finite renormalization procedure the radiative corrections can be eliminated at order ?2, after which the en[...]texto impreso
Gómez Nicola, Ángel ; Cebollada, F. ; Palomares, F. J. ; Sánchez, N. ; González Herrera, Elvira María ; González, J. M. ; Vicent López, José Luis | American Institute of Physics | 2014-03-10In this work, we improve the ability to tailor the switching mechanism in nanomagnets by introducing an additional, highly controlled source of anisotropy: magnetocrystalline anisotropy. We analyze the vortex dynamics in single crystal Fe nanotr[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2010We introduce the concept of viscosity (both shear and bulk) in the context of hadron physics. and in particular the meson gas, highlighting the current theoretical efforts to connect possible measurements of the viscosities to underlying physics[...]texto impreso
Ciliberti, S. ; Grigera, T.S. ; Martín Mayor, Víctor ; Parisi, G. ; Verrocchio, P. | American Institute of Physics | 2003-10-21A simple model of harmonic vibrations in topologically disordered systems, such as glasses and supercooled liquids, is studied analytically by extending Euclidean random matrix theory to include vector vibrations. Rather generally, it is found t[...]texto impreso
We discuss generalizations of the well known concept of canonical transformations fo symplectic structures to the case of hyperkahler structures. Different characterizations, which are equivalent in the symplectic case, give rise to non-equival[...]texto impreso
Gómez, P. ; Jiménez, J. ; Martín, P. ; Piqueras de Noriega, Javier ; Domínguez-Adame Acosta, Francisco | American Institute of Physics | 1993-11-15The effect of oxygen loss on the luminescence of YBa_2Cu_3O_(7-x) has been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM) and by Raman microprobe measurements. The results herein indicate that a CL band at 530[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Santos, M. T. ; Remon, A. ; Garcia, J. A. ; Dieguez, E. ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-05-01Cathodoluminescence and photoluminescence of Bi_(12)Si_(O)20 and Bi_(12)GeO_(20) samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm [...]texto impreso
Cathodoluminescence and photoluminescence in the core region of Bi_12GeO_20 and Bi_12SiO_20 crystals
Cremades Rodríguez, Ana Isabel ; Santos, M. T. ; Remon, A. ; Garcia, J. A. ; Dieguez, E. ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-05-01Cathodoluminescence and photoluminescence of Bi_12SiO_20 and Bi_12GeO_20 samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm band is [...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Volciuc, O. ; Popa, V. ; Tiginyanu, I. M. | American Institute of Physics | 2006-07-15Cathodoluminescence (CL) microscopy and spectroscopy have been used to investigate the optical properties of GaN microstructures patterned by Ar+ ion irradiation and subsequent photoelectrochemical (PEC) etching. Monochromatic CL images and CL s[...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-03Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the luminescence mechanisms in tin oxide. Sintered material prepared from high purity powder has been found to show a strong dependence of the CL emi[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Golubev, VG. ; Kurdyukov, D.A. ; Pevtsov, A. B. | American Institute of Physics | 2001-10-01Synthetic opals infilled with silicon (opal-Si) and with Si and Pt (opal-Pt-Si) have been irradiated in a scanning electron microscope under high excitation conditions. Electron irradiation-induced changes in the morphology and luminescent defec[...]texto impreso
Wang, K. ; Martin, R. W. ; Nogales Díaz, Emilio ; Edwards, P. R. ; O’Donnell, K. P. ; Lorenz, K. ; Alves, E. ; Watson, I. M. | American Institute of Physics | 2006-09-25AlInN layers implanted with europium and erbium ions are systematically studied and compared with similarly implanted GaN. Cathodoluminescence from four series of annealed samples shows that the Eu/Er emissions from AlInN are considerably broade[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Solís, J. | American Institute of Physics | 1996-05-15Planarization of large grain diamond films has been induced by 193 nm excimer laser irradiation. Secondary emission images and cathodoluminescence (CL) in the scanning electron microscope have been used to characterize-the irradiated area. Irrad[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Xavier, C. ; Monteiro, T. ; Pereira, E. ; Meyer, B.K. ; Hofmann, D. M. ; Fischer, S. | American Institute of Physics | 1996-12-15GaN epitaxial layers have been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM). The most prominent feature of the spectra is a complex band at 2.2 eV, whose evolution with temperature and excitation density sug[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Vincent, J. ; Piqueras de Noriega, Javier ; Bermudez, V. ; Dieguez, E. | American Institute of Physics | 2005-01-15The radiative recombination properties of Se-doped GaSb crystals grown by the Bridgman method have been investigated by cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope. A CL band centered at about 765 meV[...]texto impreso
A formalism is presented in order to impose causality conditions for finite?range interactions which do not require the existence of wave packets with a sharp front. The absence of bound states and particle production is assumed. Two different c[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1991-01-01Grain boundaries in GaP and InP have been studied by infrared cathodoluminescence (CL). In GaP the results indicate that there exists a depletion region beside grain boundaries where the concentration of P(Ga) antisite defects is lower than in t[...]texto impreso
Rezgui, B. Drid ; Gourbilleau, F. ; Maestre Varea, David ; Palais, O. ; Sibai, A. ; Lemiti, M. ; Bremond, G. | American Institute of Physics | 2012-07-15Experimental investigation of photoconductivity in Si-rich silicon oxide (SRSO)/SiO_2 multilayer (ML) structures prepared by magnetron reactive sputtering is reported. Photocurrent (PC) measurements show that the PC threshold increases with decr[...]texto impreso
We study the dependence of the ? ? scattering phase shifts on the light quark mass in both standard and unitarized SU(2) Chiral Perturbation Theory (ChPT) to one and two loops. We then use unitarized SU(3) ChPT to study the elastic f_0(600), k(8[...]texto impreso
Guzmán Navarro, G ; Herrera Zaldivar, M. ; Valenzuela Benavides, J. ; Maestre Varea, David | American Institute of Physics | 2011-07-01We report a cathodoluminescence (CL) study of ß-Ga_2O_3 nanowires grown by thermal evaporation of GaN on Si(100) and Au/Si(00) substrates. Condensation and subsequent oxidation of metallic Ga is suggested as the growth mechanism of ß-Ga_2O_3 nan[...]texto impreso
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Bourhrous, Hassan ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter | American Institute of Physics | 2012We present a description of CMB anisotropies generated by tensor perturbations in f(R) theories of gravity. The temperature power spectrum in the special case of f(R) = Rn is computed using a modified version of CAMB package.texto impreso
Marín Palacios, María Pilar ; Aragón, A. M ; Garcia Escoria, A. ; Lieblich, M. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio | American Institute of Physics | 2013-01-28Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 powder particles have been obtained by gas atomization. Magnetization curves and coercivity were studied for particles ranging in size up to 1000?. The overall magnetic behavior of such material is consequence of c[...]texto impreso
Rosado Vélez, Jaime ; Blanco Ramos, Francisco ; Arqueros Martínez, Fernando | American Institute of Physics | 2011Experimental results of the absolute air-fluorescence yield are given very often in different units (photons/MeV or photons/m) and for different wavelength intervals. In this work we present a comparison of available results normalized to its va[...]texto impreso
González Díaz, Germán ; Artús, L. ; Blanco, N. ; Cuscó, R. ; Ibañez, J. ; Long, A.R. ; Rahman, M. | American Institute of Physics | 2000-12-01We have verified the accuracy of free-charge determinations from Raman scattering in doped semiconductors by comparing the results obtained from phonon-plasmon coupled-mode line-shape fits with the charge-density values extracted from the analys[...]texto impreso
Bedeaux, D. ; Ortiz de Zárate Leira, José María ; Pagonabarraga, I. ; Sengers, J. V. ; Kjelstrup, S. | American Institute of Physics | 2011-09-28In this paper, we consider a simple reaction-diffusion system, namely, a binary fluid mixture with an association-dissociation reaction between two species. We study fluctuations at hydrodynamic spatiotemporal scales when this mixture is driven [...]texto impreso
Ortiz de Zárate Leira, José María ; Sengers, Jan V. ; Bedeaux, Dick ; Kjelstrup, Signe | American Institute of Physics | 2007-07-21In this paper a simple reaction-diffusion system, namely a binary fluid mixture with an association-dissociation reaction between the two components, is considered. Fluctuations at hydrodynamic spatiotemporal scales when a temperature gradient i[...]texto impreso
A new causal boundary, which we will term the l-boundary, inspired by the geometry of the space of light rays and invariant by conformal diffeomorphisms for space-times of any dimension m ? 3, proposed by one of the authors [R. J. Low, The Space[...]texto impreso
Navascués Cobo, Miguel ; Pérez García, David ; Junge, Marius ; Palazuelos Cabezón, Carlos ; Scholz, V. B. ; R. F. Werner, R. F. | American Institute of Physics | 2011We show that Tsirelson's problem concerning the set of quantum correlations and Connes' embedding problem on finite approximations in von Neumann algebras (known to be equivalent to Kirchberg's QWEP conjecture) are essentially equivalent. Specif[...]texto impreso
Gómez Nicola, Ángel ; Gilbert, D. A. ; González Herrera, Elvira María ; Liu, Kai ; Vicent López, José Luis | American Institute of Physics | 2013-02-04Hybrid superconducting/magnetic nanostructures on Si substrates have been built with identical physical dimensions but different magnetic configurations. By constructing arrays based on Co-dots with in-plane, out-of-plane, and vortex state magne[...]texto impreso
Hoyo Muñoz, Jesús del ; Martínez Vázquez, Rebeca ; Sotillo Buzarra, Belén ; Teddy Fernández, Toney ; Siegel, Jan ; Fernández Sánchez, Paloma ; Osellame, Roberto ; Solís Céspedes, Francisco Javier | American Institute of Physics | 2014Local compositional changes induced by high repetition rate fs-laser irradiation can be used to produce high performance optical waveguides in phosphate-based glasses. The waveguide refractive index contrast is determined by the local concentrat[...]texto impreso
Sotillo Buzarra, Belén ; Escalante, G. ; Radoi, C. ; Muñoz San José, V. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma | American Institute of Physics | 2019-12-14The effect of plastic deformation on the optical and structural properties of ZnSe crystals has been investigated. The optical properties have been monitored by cathodoluminescence measurements as a function of the deformation degree. Remarkable[...]texto impreso
Abdelwahab, Mohamed ; Cruz Dombriz, Álvaro de la ; Dunsby, P.K.S. | American Institute of Physics | 2013We study for the first time a complete analysis of the imprint of tensor anisotropies on the Cosmic Microwave Background for a class of f(R) gravity theories within the CAMB-PPF framework. Herein we present the most relevant equations, both for [...]texto impreso
Llanes Estrada, Felipe José ; Cotanch, Steve ; General, Ignacio ; Wang, Ping | American Institute of Physics | 2008The Coulomb gauge model, involving an effective QCD Hamiltonian in the Coulomb gauge, is applied to scalar hadrons. Mass predictions are presented for both conventional q ¯ q meson and q ¯ qq ¯ q tetra-quark states. Mixing matrix elements betwee[...]texto impreso
Hoshino, M. ; Limao Vieira, P. ; Suga, A. ; Kato, H. ; Ferreira da Silva, F. ; Blanco Ramos, Francisco ; García, G. ; Tanaka, H. | American Institute of Physics | 2015-07-14Absolute differential cross sections (DCSs) for electron interaction with BF3 molecules have been measured in the impact energy range of 1.5-200 eV and recorded over a scattering angle range of 15 degrees-150 degrees. These angular distributions[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo ; Iborra, E. | American Institute of Physics | 1987-11-15Structural, compositional, optical, and electrical properties of CuInSe2thin filmsgrown by rf reactive sputtering from a Se excess target in Ar/H2 atmospheres are presented. The addition of H2 to the sputtering atmospheres allows the control of [...]texto impreso
If dark energy can be described as a perfect fluid, then, apart from its equation of state relating energy density and pressure, we should also especify the corresponding rest frame. Since dark energy is typically decoupled from the rest of comp[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-02-15The deep levels present in semiconducting CdTe and semi-insulating CdTe:Cl and Cd0.8Zn0.2Te have been investigated by means of cathodoluminescence, deep level transient spectroscopy (DLTS), photo-induced current transient spectroscopy, and photo[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; García, S. ; Martín Pacheco, Jaime Miguel ; Castán, E. ; Dueñas, S. | American Institute of Physics | 1995-11-01Current-voltage, small-signal measurements, and deep-level transient spectroscopy (DLTS) spectra of p-n junctions made by Mg implantation into undoped InP are described. The I-V characteristics show that the dominant conduction mechanism at forw[...]texto impreso
González Díaz, Germán ; Martín, J.M. ; Barbolla, J. ; Castán, E. ; Dueñas, S. ; Pinacho, R. ; Quintanilla, L. | American Institute of Physics | 1997-04-01In this work, we investigate the deep levels present in ion implanted and rapid thermal annealed (RTA) InP p(+)-n junctions. The samples were implanted with magnesium or coimplanted with magnesium and phosphorus. These levels were characterized [...]texto impreso
Díaz-Guerra Viejo, Carlos ; Kurdyukov, D.A. ; Piqueras de Noriega, Javier ; Sokolov, V. I. ; Zamoryanskaya, M. V. | American Institute of Physics | 2001-03-01Synthetic opals-composed of 250 nm amorphous silica spheres closed packed in a face centered cubic structure-have been infilled with silicon, platinum, and with Si and different Pt contents. The luminescent properties of these composites have be[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Castaldini, A. ; Cavallini, A. ; Polent, L. | American Institute of Physics | 2003-12-15The electronic recombination properties of Mg-doped GaN have been investigated by steady state and time-resolved cathodoluminescence (TRCL) in the scanning electron microscope, photocurrent (PC) spectroscopy, and optical beam induced current (OB[...]texto impreso
The structure of defects of SiNx:H films is investigated by electron-spin resonance. It is found that a relaxation process takes place at annealing temperatures below 600 degrees C for those compositions in which the nitrogen-to-silicon ratio is[...]texto impreso
We study the dependence of the ? ? scattering phase shifts on the light quark mass in both standard and unitarized SU(2) Chiral Perturbation Theory (ChPT) to one and two loops. We then use unitarized SU(3) ChPT to study the elastic f(0)(600), k [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; García, S. ; Castán, E. ; Dueñas, S. ; Fernández, M. | American Institute of Physics | 1998-01-01We have analyzed the electrical properties and bonding characteristics of SiNx:H thin films deposited at 200 degrees C by the electron cyclotron resonance plasma method. The films show the presence of hydrogen bonded to silicon (at the films wit[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier | American Institute of Physics | 2011-09-15A detailed study on the resulting impurity profile in Si samples implanted with high doses of Ti and subsequently annealed by pulsed-laser melting (PLM) is reported. Two different effects are shown to rule the impurity profile redistribution dur[...]texto impreso
Pérez, E. ; Dueñas, S. ; Castán, H. ; García, H. ; Bailón, L. ; Montero, Daniel ; García Hernansanz, Rodrigo ; García Hemme, Eric ; Olea Ariza, Javier ; González Díaz, Germán | American Institute of Physics | 2015-12-28The energy levels created in supersaturated n-type silicon substrates with titanium implantation in the attempt to create an intermediate band in their band-gap are studied in detail. Two titanium ion implantation doses (1013 cm-2 and 1014 cm-2)[...]texto impreso
Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del | American Institute of Physics | 2007-10-01We report results on the temporal evolution of the diffraction efficiency of volume holographic gratings recorded in a photopolymer glass incorporating Zr-based high refractive index species (HRIS) at molecular level. We record high spatial freq[...]texto impreso
The quasiclassical limit of the scalar nonlocal ?? -problem is derived and a quasiclassical version of the ??-dressing method is presented. Dispersionless Kadomtsev– Petviashvili (KP), modified KP, and dispersionless two- dimensional Toda latt[...]texto impreso
In this work we present a theoretical study on the thermal and electrical conductivities of quasicrystals. By considering a realistic model for the spectral conductivity we derive closed analytical expressions for the transport coefficients whic[...]texto impreso
Campoamor Stursberg, Otto Ruttwig ; Gascon, F.G. ; Peralta-Salas, D. | American Institute of Physics | 2001-12Analytical and geometrical information on certain dynamical systems X is obtained under the assumption that X is embedded into a certain real Lie algebra.texto impreso
Khaderbad, M. A. ; Dhar, S. ; Pérez García, Lucas ; Ploog, K. H. ; Melnikov, A. ; Wieck, A. D. | American Institute of Physics | 2007-08-13The authors have studied the effect of annealing on the magnetic and the structural properties of Gd focused ion beam implanted GaN samples. Molecular beam epitaxy grown GaN layers, which were implanted with 300 keV Gd^(3+) ions at room tempera[...]texto impreso
Varela del Arco, M. ; Gómez, Víctor J. ; Grandal, Javier ; Núñez Cascarejo, Arántzazu ; Naranjo, Fernando B. ; Sánchez García, M. A. ; Calleja, E. | American Institute of Physics | 2018-10This work studies the effect of four different types of buffer layers on the structural and optical properties of InGaN layers grown on Si(111) substrates and their correlation with electrical characteristics. The vertical electrical conduction [...]texto impreso
Matkovic, A. ; Guzmán, R. ; Sánchez Blázquez, P. ; Cardiel López, Nicolás ; Gorgas García, Francisco Javier | American Institute of Physics | 2009We derive ages, metallicities and [alpha/Fe] ratios for dwarf early-type galaxies (dE/dS0) in the center and a region believed to be infalling into the Coma cluster. We find that a set of metallic indices cannot be described by linear relations [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del | American Institute of Physics | 2010-06-01The influence of the silicon nitride blocking layer thickness on the interface state densities (D(it)) of HfO(2)/SiN(x):H gate-stacks on n-type silicon have been analyzed. The blocking layer consisted of 3 to 7 nm thick silicon nitride films dir[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Solís, J. | American Institute of Physics | 1999-01-15Pulsed laser treatments have been performed in GaN samples of both n- and p-type conductivity. The laser induced changes have been monitored by emissive mode and cathodoluminescence (CL) in a scanning electron microscope. Emissive mode observati[...]texto impreso
Navarro, I. ; Pulido, E. ; Crespo del Arco, Patricia ; Hernando Grande, Antonio | American Institute of Physics | 1993-03-15It is shown that the presence of highly anisotropic magnetic precipitates in a soft multiphased matrix can produce a remarkable hardening, even when the volume fraction of the precipitates is small. The exchange coupling between the matrix and t[...]texto impreso
Bruno, F. Y. ; Garcia Barriocanal, Javier ; Torija, M. ; Rivera Calzada, Alberto Carlos ; Sefrioui, Zouhair ; Leighton, C. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2008-02-25Electrical transport properties of heteroepitaxial p-n junctions made of La_(0.8)Sr_(0.2)CoO_(3) and SrTi_(0.99)Nb_(0.01)O_(3) were studied. Junctions display highly rectifying current-voltage characteristics over a wide temperature range (20–30[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Albrecht, M. ; Krinke, J. ; Dimitrov, R. ; Stutzmann, M. ; Strunk, H. P. | American Institute of Physics | 2000-03-01Combined electron beam induced current and transmission electron microscopy (TEM) measurements have been performed on both undoped and Si-doped AlGaN epitaxial films with aluminum contents x ranging from x = 0 to x = 0.79, in order to correlate [...]texto impreso
García Hemme, Eric ; Yu, K. M. ; Wahnon, P. ; González Díaz, Germán ; Walukiewicz, W. | American Institute of Physics | 2015-05-04We report the effect of d-levels of vanadium atoms on the electronic band structure of ZnO. Polycrystalline layers of Zn_(1-x)V_(x)O with 0 ? x ? 0.08 were synthesized using magnetron sputtering technique. Electrical measurements show that el[...]texto impreso
We report a study of metal-insulator-semiconductor (MIS) structures on InP. The interfacial state density and deep levels existing in MIS structures were measured by deep level transient spectroscopy (DLTS) technique. The electrical insulator pr[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 1999-08-15A correlative study of the electrically active grain boundary structure of ZnO polycrystals has been carried out using a scanning electron microscope/scanning tunneling microscope (SEM/STM) combined instrument. Current imaging tunneling spectros[...]texto impreso
Rivera Calzada, Alberto Carlos ; Santamaría Sánchez-Barriga, Jacobo ; León Yebra, Carlos | American Institute of Physics | 2001-01-29We report on complex admittance measurements on ZrO_(2):Y_(2)O_(3) (YSZ) thin films in the parallel plate geometry. Highly textured YSZ thin films, grown by rf sputtering, allow measuring complex admittance free of the effect of charge blocking [...]texto impreso
Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | American Institute of Physics | 1980The scattering of electromagnetic waves by an infinite dielectric cylinder with variable dielectric permeability presents, in general, certain mathematical difficulties regarding the construction of rigorous solutions. We give a new divergencele[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 1999-02-01In the present work, electron beam induced current (EBIC) has been applied to characterize several kinds of chemical vapor deposition diamond films. Regions of enhanced carrier recombination are detected in plan-view observations of thin films a[...]texto impreso
Schmidt, Rainer ; Basu, A. ; Brinkman, A. W. ; Klusek, Z. ; Datta, P. K. | American Institute of Physics | 2005-02-14The resistance versus temperature (R–T) characteristics of NiMn_(2)O_(4+?) thermistors have been analyzed. In the literature, electron transport in manganate spinels is commonly described by a small-polaron model for nearest neighbor hopping, bu[...]texto impreso
Gómez, I. ; Domínguez-Adame Acosta, Francisco ; Díez, E. ; Bellani, V. | American Institute of Physics | 1999-04-01We study the electron transmission probability in semiconductor superlattices where the height of the barriers is modulated by a Gaussian profile. Such structures act as efficient energy band-pass filters and, contrary to previous designs, it is[...]texto impreso
The Hamiltonian for an electron in Z^2 , interacting with a perpendicular periodic magnetic field, is shown to be gauge equivalent to a periodic Hamiltonian. The wave function of the system is computed in terms of a ground state of the continuou[...]texto impreso
The generalized covariant Dirac equation for a certain five?dimensional universe is studied. If a torsion invariant is included in the free Lagrangian, it is shown that particlelike stable solutions exist having definite positive rest energy, sp[...]texto impreso
Pérez, E. ; Castán, H. ; García, H. ; Dueñas, S. ; Bailón, L. ; Montero Álvarez, Daniel ; García-Hernansanz, R. ; García Hemme, Eric ; Olea Ariza, Javier ; González Díaz, Germán | American Institute of Physics | 2015-01In the attempt to form an intermediate band in the bandgap of silicon substrates to give it the capability to absorb infrared radiation, we studied the deep levels in supersaturated silicon with titanium. The technique used to characterize the e[...]texto impreso
ailoring the structure of nanocrystalline microstructures is an important step toward controlled design of novel nanostructured materials and devices. We demonstrate how the nanocrystalline microstructure of Co-rich ribbons can be tuned by annea[...]texto impreso
Perez de Lara, Daniel ; Alija, A. ; González Herrera, Elvira María ; Martín, J. I. ; Vélez, M. ; Colino, J. L. ; Anguita,, J. V. ; Vicent López, José Luis | American Institute of Physics | 2009-03-23Superconducting a-Mo_(3)Si and Nb films have been grown on arrays of Ni nanodots. We have studied the vortex lattice dynamics close to critical temperatures. Different vortex lattice configurations are obtained with the same array unit cell. The[...]texto impreso
Masanes, Lluís ; Müller, M.P. ; Pérez García, David ; Augusiak, Remigiusz | American Institute of Physics | 2014-12We consider a very natural generalization of quantum theory by letting the dimension of the Bloch ball be not necessarily three. We analyze bipartite state spaces where each of the components has a d-dimensional Euclidean ball as state space. In[...]texto impreso
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Tsallis, C. ; Plastino, A.R. ; Fernández Álvarez-Estrada, Ramón | American Institute of Physics | 2009-04Escort mean values or q-moments constitute useful theoretical tools for describing basic features of some probability densities such as those which asymptotically decay like power laws. They naturally appear in the study of many complex dynamica[...]texto impreso
We report on Raman scattering measurements on annealed In0.53Ga0.47As/InP layers that reveal the outdiffusion of phosphorus from, the substrate and its, possible incorporation in substitutional positions in. the In0.53Ga0.47As lattice. Raman sig[...]texto impreso
Piqueras de Noriega, Javier ; Díaz-Guerra Viejo, Carlos ; Vila Santos, María | American Institute of Physics | 2010-05-10Exchange anisotropy has been observed and investigated in single-crystalline CuO nanowires grown by thermal oxidation of Cu. The exchange bias field decreases by increasing temperature and can be tuned by the strength of the cooling field. A tra[...]texto impreso
Jones, D. B. ; Neves, R.F.C. ; Lopes, M. C. A. ; da Costa, R.F. ; Varella, M. T. do N. ; Bettega, M. H. F. ; Lima, M. A. P. ; García, G. ; Blanco Ramos, Francisco ; Brunger, M. J. | American Institute of Physics | 2015-12-14We report cross sections for electron-impact excitation of vibrational quanta in furfural, at intermediate incident electron energies (20, 30, and 40 eV). The present differential cross sections are measured over the scattered electron angular r[...]texto impreso
Chiari, Luca ; Zecca, Antonio ; Blanco Ramos, Francisco ; Brunger, M. J. | American Institute of Physics | 2016-02-28Isomerism is ubiquitous in chemistry, physics, and biology. In atomic and molecular physics, in particular, isomer effects are well known in electron-impact phenomena; however, very little is known for positron collisions. Here we report on a se[...]texto impreso
Kholmetskii, Alexsander L. ; Missevitch, Oleg V. ; Smirnov Rueda, Román ; Ivanov, Alexander R. ; Chubykalo, Andrey E. | American Institute of Physics | 2007-01-15We start with the fact that the actual consensus on the empirical verification of the standard retardation condition does not take into account the complex structure of the whole electromagnetic field in the near zone. The most rigorous and meth[...]texto impreso
González Díaz, Germán ; García Hemme, Eric ; Olea Ariza, Javier ; Pastor Pastor, David ; Bailón, L. ; Castán, H. ; Dueñas, S. ; García, H. ; Pérez, E. | American Institute of Physics | 2013-01-14Intermediate band formation on silicon layers for solar cell applications was achieved by titanium implantation and laser annealing. A two-layer heterogeneous system, formed by the implanted layer and by the un-implanted substrate, was formed. I[...]