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American Institute of Physics |
Documentos disponibles de esta editorial (326)
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Finkel Morgenstern, Federico ; González López, Artemio ; Kamran, Niky ; Rodríguez González, Miguel Ángel | American Institute of Physics | 1999-07In this paper we point out a close connection between the Darboux transformation and the group of point transformations which preserve the form of the time-dependent Schroumldinger equation (TDSE). In our main result, we prove that any pair of t[...]texto impreso
We show an alternative construction of the first example of a simply-connected compact symplectic non-formal 8-manifold given in [6].We also give an alternative proof of its non-formality using higher order Massey products.texto impreso
Díaz-Cano Ocaña, Antonio ; Gonzalez Gascón, F. ; Peralta Salas, Daniel | American Institute of Physics | 2006Dynamical systems on R-n presenting geometric chaos, i.e., open domains where bounded and unbounded orbits are intermingled, have been constructed. The opposite situation (open scattering) has been studied for integrable Hamiltonian and non-Hami[...]texto impreso
Dark energy is usually parametrized as a perfect fliud with negative pressure and a certain equation of state. Besides, it is supposed to interact very weakly with the rest of the components of the universe and, as a consequence, there is no rea[...]texto impreso
We determine fundamental systems of invariants for complex solvable rigid Lie algebras having nonsplit nilradicals of characteristic sequence (3, 1, .., 1), these algebras being the natural followers of solvable algebras having Heisenberg nilrad[...]texto impreso
González Gascón, Francisco ; Ramos, F.B. ; Aguirre Dabán, Eduardo | American Institute of Physics | 1982It is shown that any first integral of type P2()—a polynomial of degree 2 in —of the differential equation =Vx can be obtained from a pointlike gauge symmetry of the action AL associated to L= 1/2 2+V(t,x). The same result holds for any first in[...]texto impreso
The compressibility equation of a fluid with an effective, state-dependent, pair-potential is derived. It is shown that the thermodynamic states for which the infinite wavelength limit of the static structure factor diverges are not consistent w[...]texto impreso
This letter analyzes the quality of reproduction of holograms recorded in thermoplastic media as a function of the variations in coating thickness of the different layers. The fidelity of reproduction is investigated by means of a phase sampling[...]texto impreso
Optical energy gaps are measured for high-quality Al_(1-x)In_xN-on-GaN epilayers with a range of compositions around the lattice match point using photoluminescence and photoluminescence excitation spectroscopy. These data are combined with stru[...]texto impreso
Carreño Sánchez, Fernando ; Martínez Antón, Juan Carlos ; Bernabeu Martínez, Eusebio | American Institute of Physics | 1994-08Optical interference fringe measurements of the thickness of weakly absorbing media can be rapid, accurate, and nondestructive. When the refractive index n of the sample is known, it will give us the layer thickness d. If, however, n is unknown,[...]texto impreso
González Díaz, Germán ; Bernabeu Martínez, Eusebio ; Hernández Rojas, J. L. ; Escudero, J. L. ; Guerrero, H. | American Institute of Physics | 1993-09-01Bulk polycrystalline cadmium manganese telluride, Cd(l-x)Mn(x)Te, was manufactured in several compositions by a synthesis process. The structure of the obtained compounds was the characteristic zinc-blende polycrystalline pattern being the grain[...]texto impreso
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Dutta, P. S. ; Sreedhar, A. K. ; Bhat, H. L. ; Dubey, G. C. ; Kumar, V. ; Dieguez, E. ; Pal, U. ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-03-15Passivation of point and extended defects in GaSb has been observed as a result of hydrogenated amorphous silicon (a-Si:H) treatment by the glow discharge technique. Cathodoluminescence (CL) images recorded at various depths in the samples clear[...]texto impreso
Ruiz Valdepenas, L. ; Navarro Palma, Elena ; Vicent López, José Luis | American Institute of Physics | 2012-10-15Nd-Co amorphous magnetic films with perpendicular magnetic anisotropy have been grown on nanostructured templates prepared with self-organized di-block poly(styrene)-block-poly(4-vinylpyridine) copolymer layers with a periodic structure of 60 nm[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Institute of Physics | 2003The recent proposal of theories with compactified large extra dimensions is reviewed. We pay especial attention to brane world models with low tension where the only relevant degrees of freedom at low energies are the Standard Model (SM) particl[...]texto impreso
Villafranca Velasco, Aitor ; Hernández Garay, María de la Paz ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del | American Institute of Physics | 2011-03-01Three different holographic photomaterials belonging to the class of photopolymerizable glasses have been synthesized using sol-gel techniques, and characterized with the purpose of a comparative study. Their behavior is analyzed in terms of ach[...]texto impreso
Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel | American Institute of Physics | 2013-06-21A novel formulation and synthesis method to overcome the thickness limitations in samples of photopolymerizable glasses with high refractive index species is presented. The reported method allows the recording of volume holographic diffraction g[...]texto impreso
Montes Gutiérrez, David ; López Santiago, J. ; Martínez Arnáiz, R. M. ; Guillout, P. ; Klutsch, A. ; Freire Ferrero, R. ; Frasca, A. ; Marilli, E. | American Institute of Physics | 2009Post T Tauri stars (PTTS) are late-type stars in the age range between 10 and 100 Myr filling the gap between T Tauri (TTs) and zero-age: main sequence phases. This period of evolution remains ambiguous and until now different studies of young s[...]texto impreso
Llanes Estrada, Felipe José ; Guo, F.-K. ; Hanhart, C. ; Cleven, M | American Institute of Physics | 2011The pion mass dependence of the pion vector form factor is investigated using the Omnes representation. Our prediction agrees with later lattice results quite well. The nice agreement of the pion mass dependence of the scattering lengths of the [...]texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; Rodríguez González, Miguel Ángel | American Institute of Physics | 1996-08In this paper we show that a quasi-exactly solvable (normalizable or periodic) one-dimensional Hamiltonian satisfying very mild conditions defines a family of weakly orthogonal polynomials which obey a three-term recursion relation. in particula[...]texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; Rodríguez González, Miguel Ángel | American Institute of Physics | 1997-06The algebraic structures underlying quasi-exact solvability for spin 1/2 Hamiltonians in one dimension are studied in detail. Necessary and sufficient conditions for a matrix second-order differential operator preserving a space of wave function[...]texto impreso
González Díaz, Germán ; Martín, J.M. ; Artús, L. ; Cuscó, R. ; Ibañez, J. | American Institute of Physics | 1997-10-15We have studied the lattice recovery by rapid thermal annealing of Si+-implanted InP using Raman spectroscopy. The crystallinity recovery for different annealing temperatures of samples totally amorphized by the implantation can be monitored by [...]texto impreso
Mártil de la Plaza, Ignacio ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2000-02-01The effect of rapid thermal annealing processes on the properties of SiO2.0 and SiN1.55 films was studied. The films were deposited at room temperature from N-2 and SiH4 gas mixtures, and N-2, O-2, and SiH4 gas mixtures, respectively, using the [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2003-08-15We present in this article a comprehensive study of rapid thermal annealing (RTA) effects on the physical properties of SiNx:H thin films deposited by the electron cyclotron resonance plasma method. Films of different as-deposited compositions ([...]texto impreso
Nogales Díaz, Emilio ; García, José A. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | American Institute of Physics | 2007-02-01Red luminescence emission from chromium doped ß-Ga_2O_3 nanowires has been studied by means of photoluminescence (PL) techniques. PL excitation shows several bands in the ultraviolet-visible region. Time decay values, obtained by time resolved P[...]texto impreso
One of the major disadvantages of coarse-grained hydrogen bond potentials, for their use in protein folding simulations, is the appearance of abnormal structures when these potentials are used in flexible chain models, and no other geometrical r[...]texto impreso
The demixing transition of a binary fluid mixture of additive hard spheres is analyzed for different size asymmetries by starting from the exact low-density expansion of the pressure. Already within the second virial approximation the fluid sepa[...]texto impreso
Rocci, Mirko ; Tornos Castillo, Javier ; Rivera Calzada, Alberto Carlos ; Sefrioui, Zouhair ; Clement, Marta ; Iborra, Enrique ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2014-03-10We report on the fabrication and magnetotransport characterization of hybrid graphene-based nanodevices with epitaxial nanopatterned La_(0.7)Sr_(0.3)MnO_(3) manganite electrodes grown on SrTiO_(3)(100). The few-layer graphene was deposited onto [...]texto impreso
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo ; Iborra, E. | American Institute of Physics | 1989-04-15All?sputtered CuInSe2/CdS solar cellheterojunctions have been analyzed by means of capacitance?frequency (C?F) and capacitance?bias voltage (C?V) measurements. Depending on the CuInSe2 layer composition, two kinds of heterojunctions were analyze[...]texto impreso
Mártil de la Plaza, Ignacio ; Bravo, D. ; Fernández, M. ; García, S. ; López, F.J. | American Institute of Physics | 1995-11-27SiNx:H films with a wide composition range and, some of them, with low oxygen content are deposited at room temperature. The defects observed in the films are attributed to Si-dangling bonds, with a structure depending on film composition. For t[...]texto impreso
Mártil de la Plaza, Ignacio ; García Hemme, Eric ; García Hernansanz, Rodrigo ; González Díaz, Germán ; Olea Ariza, Javier ; Pastor Pastor, David ; Prado Millán, Álvaro del | American Institute of Physics | 2014-05-26We report room-temperature operation of 1 x 1 cm(2) infrared photoconductive photodetectors based on silicon supersaturated with titanium. We have fabricated these Si-based infrared photodetectors devices by means of ion implantation followed by[...]texto impreso
Mártil de la Plaza, Ignacio ; García Hemme, Eric ; García Hernansanz, Rodrigo ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | American Institute of Physics | 2013-08-07In this study, we present a structural and optoelectronic characterization of high dose Ti implanted Si subsequently pulsed-laser melted (Ti supersaturated Si). Time-of-flight secondary ion mass spectrometry analysis reveals that the theoretical[...]texto impreso
Lucía Mulas, María Luisa ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique ; Feijoo, P.C. ; Toledano-Luque, M. | American Institute of Physics | 2010-04-15Scandium oxide (ScO(x)) thin layers are deposited by high-pressure sputtering (HPS) for physical and electrical characterization. Different substrates are used for comparison of several ScO(x)/Si interfaces. These substrates are chemical silicon[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1989-09-15Polycrystalline GaP and InP have been observed by scanning electron acoustic microscopy. While grain boundaries show a weak contrast, twinned regions are clearly revealed. Results suggest that the contrast observed is related to signal generatio[...]texto impreso
Urchulutegui, M. ; Piqueras de Noriega, Javier ; LLopis, J. | American Institute of Physics | 1989-04-01The capability of scanning electron?acoustic microscopy in the characterization of MgO crystals has been studied. The conditions for the observation of different surface and subsurface features in as?grown and deformed crystals are described and[...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plaza, J. L. ; Dieguez, E. | American Institute of Physics | 1999-08-01Er doped GaSb single crystals have been studied by scanning tunneling spectroscopy (STS) and cathodoluminescence (CL) in a combined scanning electron microscope-scanning tunnelling microscope system. The surface band gap in doped samples has bee[...]texto impreso
Wang, K. ; Martin, R. W. ; O’Donnell, K. P. ; Katchkanov, V. ; Nogales Díaz, Emilio ; Lorenz, K. ; Alves, E. ; Ruffenach, S. ; Briot, O. | American Institute of Physics | 2005-09-12The intensity of Eu-related luminescence from ion-implanted GaN with a 10 nm thick AlN cap, both grown epitaxially by metal organic chemical vapor deposition (MOCVD) is increased markedly by high-temperature annealing at 1300 ?C. Photoluminescen[...]texto impreso
Gascón, Francisco G. ; Peralta Salas, Daniel ; Ruiz Sancho, Jesús María | American Institute of Physics | 2000-05It is shown that when a dynamical system X0 with a proper set of global first integrals is perturbed, the phase space region accessible to the orbits of the perturbed vector field X0+Xp is bounded (we are assuming here that the time variable run[...]texto impreso
Álvarez Galindo, Gabriel ; Martínez Alonso, Luis ; Medina Reus, Elena ; Vázquez, Juan Luis | American Institute of Physics | 2020-04-01We consider separatrix solutions of the differential equations for inflaton models with a single scalar field in a zero-curvature Friedmann-Lemaitre-Robertson-Walker universe. The existence and properties of separatrices are investigated in the [...]texto impreso
Chioncel, M. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2008-12-15?-Fe_2O_3 (hematite) nanostructures with various morphologies have been grown by thermal oxidation of compacted iron powder at temperatures between 700 and 900 degrees C. Different thermal treatments have been found to induce the growth of singl[...]texto impreso
MgO crystals have been studied by scanning?electron acoustic microscopy under different experimental conditions. Contrast mechanisms in imaging are discussed and compared. The experimental results obtained by earthing or nonearthing the specimen[...]texto impreso
Gourbilleau, F. ; Ternon, C. ; Maestre Varea, David ; Palais, O. ; Dufour, C. | American Institute of Physics | 2009-07-01Si-rich-SiO_2(SRSO)/SiO_2 multilayers (MLs) have been grown by reactive magnetron sputtering. The presence of silicon nanoclusters (Si-ncls) within the SRSO sublayer and annealing temperature influence optical absorption as well as photoluminesc[...]texto impreso
We present a coarse-grained interaction potential that, using just one single interaction bead per amino acid and only realistic interactions, can reproduce the most representative features of peptide folding. We combine a simple hydrogen bond p[...]texto impreso
We describe and test a coarse-grained molecular model for the simulation of the effects of pressure on the folding/unfolding transition of proteins. The model is a structure-based one, which takes into account the desolvation barrier for the for[...]texto impreso
Konopelchenko, Boris ; Martínez Alonso, Luis ; Medina Reus, Elena | American Institute of Physics | 2000-01Integrable hierarchies associated with the singular sector of the Kadomtsev– Petviashvili (KP) hierarchy, or equivalently, with ?? operators of nonzero index are studied. They arise as the restriction of the standard KP hierarchy to submanifolds[...]texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; López Maroto, Antonio ; Rodríguez, M.A. | American Institute of Physics | 2001The most general inflaton potential in Minkowski spacetime for which the differential equation for the Fourier modes of the matter fields reduces to Lame's equation is shown to be of the form V(?) = ? ? ^(4) /4 + K ?^( )2 /2 + ?/(2 ?^( 2) ) + V_[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier ; De Diego, N. ; LLopis, J. | American Institute of Physics | 1988-04-15Cathodoluminescencescanning electron microscopy and positron annihilation techniques have been used to investigate the distribution of defects in GaP wafers. The results show the existence of a gradient of the concentration of vacancy?type defec[...]texto impreso
Díaz García, Elena ; Miralles, K. ; Domínguez-Adame Acosta, Francisco ; Gaul, Christopher | American Institute of Physics | 2014-09-08We theoretically study the occurrence of Bloch oscillations in biased hybrid graphene systems with spin-dependent superlattices. The spin-dependent potential is realized by a set of ferromagnetic insulator strips deposited on top of a gapped gra[...]texto impreso
Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Garcia Escorial, A. | American Institute of Physics | 1994-05-01Experimental results corresponding to the saturation magnetization and coercive field during the decomposition, upon annealing, of bcc and fcc Fe_xCu_(1-x), obtained by mechanical alloying are reported. The overall behavior points out that the d[...]texto impreso
Presa Muñoz del Toro, Patricia de la ; Rueda, T. ; Hernando Grande, Antonio ; Ramallo López, J. M. ; Giovanetti, L. J. ; Requejo, F. G. | American Institute of Physics | 2008-05-15In this work we present new results on spontaneous oxidation of disordered fcc FePt nanoparticles. The "as-made" oleic acid and oleylamine coated FePt nanoparticles of average size 4 nm synthesized by a high-boiling coordinating solvent method w[...]texto impreso
Moreno, F. ; Álvarez, J. M. ; Amaré, J. C. ; Bernabeu Martínez, Eusebio | American Institute of Physics | 1984The Stark widths of the 5896-Å (3^2 P_1 /2 ? 3^2 S_1 /2) neutral sodium hyperfine lines in the presence of charged perturbers were measured by means of laser saturation spectroscopy. The plasma containing the sodium atoms and the perturbers was [...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Hernández Rojas, J.L. ; Lucía Mulas, María Luisa ; Santamaría Sánchez-Barriga, Jacobo ; Sánchez Quesada, Francisco | American Institute of Physics | 1994-03-07Films of CuGaxIn(1-x)Se2 (CGIS) have been grown by rf sputtering from stoichiometric single targets with different Ga/In ratios. Adjusting growth temperature and argon pressure we are able to deposit films with a wide range of Cu contents: From [...]texto impreso
Herrero Gómez, Carlos ; Aragón Sánchez, Ana María ; Hernando Rydings, Manuel ; Marín Palacios, María Pilar | American Institute of Physics | 2014-09-01In this paper, we report an experimental study on the microwave modulated scattering intensity for a single Fe_2.25Co_72.75Si_10B_15 amorphous metallic microwire. The modulation is driven by applying a bias magnetic field that tunes the magnetic[...]texto impreso
Martínez Alonso, Luis ; Medina Reus, Elena ; Mañas Baena, Manuel | American Institute of Physics | 2006-08A scheme for solving Whitham hierarchies satisfying a special class of string equations is presented. The ?-functions of the corresponding solutions is obtained and the differential expressions of the underlying Virasoro constraints are characte[...]texto impreso
Martínez Alonso, Luis ; Medina Reus, Elena ; Mañas Baena, Manuel | American Institute of Physics | 2006-08A scheme for solving Whitham hierarchies satisfying a special class of string equations is presented. The tau-function of the corresponding solutions is obtained and the differential expressions of the underlying Virasoro constraints are charact[...]texto impreso
Dobado González, Antonio ; Delgado López, Rafael ; Llanes Estrada, Felipe José | American Institute of Physics | 2014The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up [...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2007-10-15V_2O_5 nanostructures have been grown on 4H-SiC and Si substrates by a thermal deposition method without a catalyst. High aspect ratio nanowires with rectangular cross sections were grown on 4H-SiC. High-resolution transmission electron microsco[...]texto impreso
Presa Muñoz del Toro, Patricia de la ; Multigner, M. ; Venta,, J. de la ; García, M. A. ; Ruiz González, M. L. | American Institute of Physics | 2006-12-15In this work the study of oleic acid and oleylamine-capped gold nanoparticles is presented. The structural characterization of the sample shows 6.7 nm gold nanoparticles with a narrow size distribution. The experimental optical absorption spectr[...]texto impreso
Calleja, J. F. ; Huttel, Y. ; Contreras, M. C. ; Navarro Palma, Elena ; Presa, B. ; Matarranz, R. ; Cebollada, A. | American Institute of Physics | 2006-09-01A detailed study of the structure and magnetic properties of V/Co versus Co/V bilayers grown on MgO(001) substrates with cubic and hexagonal Co crystal structures is presented. Co is found to adopt fcc structure when grown on MgO(001), while it [...]texto impreso
Maestre Varea, David ; Palais, O. ; Barakel, D. ; Pasquinelli, M. ; Alfonso, B. ; Gourbilleau, F. ; De Laurentis, M. ; Irace, A. | American Institute of Physics | 2010-03-15SiO_2 multilayers with embedded Si nanocrystals (Si-ncs) were investigated as an approach for developing highly efficient all Si tandem solar cells. The nanostructured samples, fabricated by means of a reactive magnetron sputtering, were structu[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 1990-06-01Thin films of CuGaSe2 have been produced by rf sputtering. Compositional, structural, electrical, and optical properties are strongly influenced by growthtemperature. At substrate temperatures lower than 300?°C amorphous or poorly crystalline Se[...]texto impreso
Schlabach, S. ; Szabó, D. V. ; Vollath, D. ; Presa Muñoz del Toro, Patricia de la ; Forker, M. | American Institute of Physics | 2006-07-15Bare and coated TiO? nanoparticles with particle sizes dtexto impreso
Serrano, A. ; Monton, C. ; Valmianski, I. ; Gálvez Alonso, Fernando ; Cortajarena, Aitziber L. ; De la Venta, J. ; Schuller, Ivan K. ; García, M. A. | American Institute of Physics | 2014-03-14We present a Surface Plasmon Resonance spectroscopy study of Co-Phthalocyanine (CoPc) thin films grown on Au layers at different substrate temperatures. We demonstrate that for quantitative analysis, fitting of the resonance angle alone is insuf[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1993-11-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study the upper surface and cross-sectional samples of chemical vapor deposited diamond films. The CL emission is mainly localized at the grain boundaries of the colum[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-03-01Cathodoluminescence (CL) in the scanning electron microscope has been used to study cross-sectional samples on GaN epitaxial films grown on sapphire. Increased CL emission, attributed to the presence of stacking faults and decorated dislocations[...]texto impreso
Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2001-07-15Remote electron beam induced current (REBIC) measurements have been carried out to investigate electrically active regions in Si doped GaN films. REBIC bright-dark contrast has been observed in the border of growth, round or pyramidal, hillocks,[...]texto impreso
Herrera, M. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Stutzmann, M. ; Ambacher, O. | American Institute of Physics | 2004-11Cathodoluminescence (CL) in the scanning electron microscope and atomic force microscopy (AFM) have been used to study the formation of pinholes in tensile and compressively strained AlInGaN films grown on Al2O3 substrates by plasma-induced mole[...]texto impreso
Pal, U. ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Serrano, M. D. ; Dieguez, E. | American Institute of Physics | 1994-09-15Cathodoluminescence in the scanning electron microscope has been used to investigate the relationship of point defects in CdTe and CdTe:V with luminescence bands at 1.40 and 1.13 eV. V has been found to inhibit the 1.40 eV luminescence. Annealin[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-08-20The effect of mechanical milling on the structure and luminescent properties of CdSe powder has been investigated by means of cathodoluminescence (CL) in the scanning electron microscope, transmission electron microscopy (TEM) and x-ray diffract[...]texto impreso
González Díaz, Germán ; Artús, L. ; Blanco, N ; Cuscó, R. ; Hernández, S. | American Institute of Physics | 2003-03-01Raman scattering has been used to study the lattice recovery and electrical activation of Si+-implanted In0.53Ga0.47 As achieved by rapid thermal annealing. The degree of crystallinity recovery, of totally amorphized samples is studied for annea[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | American Institute of Physics | 2011-06-01We have analyzed the structural and optical properties of Si implanted with very high Ti doses and subsequently pulsed-laser melted (PLM). After PLM, all samples exhibit an abrupt and roughly uniform, box-shaped Ti profile, with a concentration [...]texto impreso
Garcia March, M. A. ; Jimenez Villacorta, F. ; Quesada, A. ; De la Venta, J. ; Carmona Tejero, Noemi ; Lorite, I. ; LLopis, J. ; Fernandez, J. F. | American Institute of Physics | 2010-01-15We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co_3O_4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic str[...]texto impreso
Most often in chemical physics, long range van der Waals surface interactions are approximated by the exact asymptotic result at vanishing distance, the well known additive approximation of London dispersion forces due to Hamaker. However, the d[...]texto impreso
This review article is concerned with a recently ncovered connection between operator spaces, a noncommutative extension of Banach spaces, and quantum nonlocality, a striking phenomenon which underlies many of the applications of quantum mechani[...]texto impreso
By an application of the geometrical techniques of Lie, Cohen, and Dickson it is shown that a system of differential equations of the form [x^(r_i)]_i = F_i; (where r_i > 1 for every i = 1 , ... ,n) cannot admit an infinite number of pointlike [...]texto impreso
By an application of the geometrical techniques of Lie, Cohen, and Dickson it is shown that a system of differential equations of the form [x^(r_i)]_i = F_i(where r_i > 1 for every i = 1 , ... ,n) cannot admit an infinite number of pointlike sy[...]texto impreso
Gómez-Ullate Otaiza, David ; Lafortune, S. ; Winternitz, P. | American Institute of Physics | 1999-06The Lie point symmetries of a coupled system of two nonlinear differential-difference equations are investigated. It is shown that in special cases the symmetry group can be infinite dimensional, in other cases up to ten dimensional. The equatio[...]texto impreso
We consider the Manin-Radul and Jacobian supersymmetric KP hierarchies from the point of view of the tau-function formalism. Solutions of their associated systems of Sato equations are characterized in terms of correlation functions of supersymm[...]texto impreso
The variation of the electron acoustic signal as a function of temperature in ceramic materials has been studied. Scanning electron acoustic microscopy (SEAM) contrast in MgO single crystals and in reaction bonded SiC, between 100 and 273 K, is [...]texto impreso
Romero, J.J. ; Cuadrado, R. ; Arroyo, A. ; García, M. A. ; Hernando Grande, Antonio ; Cortés Gil, R ; González Calbet, J. M. ; Vallet Regí, V. | American Institute of Physics | 2006-04-15Data are presented on the thermal dependence of the hysteretic properties of cationic vacancies including manganite samples of composition LaMnO_(3+?)(?=0.05 and 0.12). Our results evidence the presence in both samples of two magnetic phases hav[...]texto impreso
Mártil de la Plaza, Ignacio ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2001-08-01Bulk properties of SiNx:H thin film dielectrics and interface characteristics of SiNx:H/Si devices are studied by a combination of electrical measurements (capacitance-voltage and current-voltage characteristics) and defect spectroscopy (electro[...]texto impreso
Ciliberti, S. ; Grigera, T.S. ; Martín Mayor, Víctor ; Parisi, G. ; Verrocchio, P. | American Institute of Physics | 2004-06Despite the presence of topological disorder, phonons seem to exist also in glasses at very high frequencies (THz) and they remarkably persist into the supercooled liquid. A universal feature of such a systems is the Boson peak, an excess of sta[...]texto impreso
The exponential solutions of the Darboux equations for conjugate nets is considered. It is shown that rank-one constraints over the right derivatives of invertible operators on an arbitrary linear space give solutions of the Darboux system, whic[...]texto impreso
Martín Mayor, Víctor ; Mézard, Marc ; Parisi, Giorgio ; Verrocchio, Paolo | American Institute of Physics | 2001-05-08A computation of the dynamical structure factor of topologically disordered systems, where the disorder can be described in terms of Euclidean random matrices, is presented. Among others, structural glasses and supercooled liquids belong to that[...]texto impreso
González Díaz, Germán ; Artús, L. ; Calleja, E. ; Cuscó, R. ; Iborra, E. ; Jiménez, J. ; Pastor, D. ; Peiró, F. | American Institute of Physics | 2006-08-15We have studied the effects of rapid thermal annealing at 1300 degrees C on GaN epilayers grown on AlN buffered Si(111) and on sapphire substrates. After annealing, the epilayers grown on Si display visible alterations with craterlike morphology[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Piqueras de Noriega, Javier | American Institute of Physics | 1995-12-01We have investigated highly doped GaAs:Te at different doping concentrations (> 10(17) cm(-3)) to assess the presence of the EL2 trap. We have utilized both capacitance and current transient spectroscopy techniques. The crucial parameter for the[...]texto impreso
Costa, Romarly F. da ; Varella, Marcio T. do N. ; Bettega, Marcio H. F. ; Neves, Rafael F. C. ; Lopess, María Cristina A. ; Blanco Ramos, Francisco ; García, Gustavo ; Jones, Darryl B. ; Brunger, Michael J. ; Lima, Marco A. P. | American Institute of Physics | 2016-03-28We report on integral-, momentum transfer-and differential cross sections for elastic and electronically inelastic electron collisions with furfural (C5H4O2). The calculations were performed with two different theoretical methodologies, the Schw[...]texto impreso
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Ardenghi, Juan S. ; Castagnino, M. ; Campoamor Stursberg, Otto Ruttwig | American Institute of Physics | 2009The nonrelativistic limit of the centrally extended Poincaré group is considered and their consequences in the modal Hamiltonian interpretation of quantum mechanics are discussed [O. Lombardi and M. Castagnino, Stud. Hist. Philos. Mod. Phys 39, [...]texto impreso
We perform extensive lattice Monte Carlo simulations of protein folding to construct and compare the equilibrium and the kinetic transition state ensembles of a model protein that folds to the native state with two-state kinetics. The kinetic de[...]texto impreso
Fuss, M. C. ; Ellis-Gibbings, L. ; Jones, D. B. ; Brunger, M. J. ; Blanco Ramos, Francisco ; Muñoz, A. ; Limao Vieira, P. ; García, G. | American Institute of Physics | 2015-06-07Water is often used as the medium for characterizing the effects of radiation on living tissue. However, in this study, charged-particle track simulations are employed to quantify the induced physicochemical and potential biological implications[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2008In this work we briefly review the Kovtun-Son-Starinet (KSS) computation of the ratio eta/s for quantum field theories with gravitational dual and the related conjecture that it is bound from below by 1/4 pi. We discuss the validity of the bound[...]texto impreso
García Guinea, Javier ; Sánchez Muñoz, Luis ; Torno, J.L. ; Crespo Feo, Elena ; Ruiz Pérez, Javier ; Martín Herrero, Álvaro Ignacio ; Cremades Rodríguez, Ana Isabel | American Institute of Physics | 2009This paper mainly focuses on the spatial distribution of plagioclase phases observed by Raman and spectra cathodoluminescence (CL) emission of in the Villalbeto de la Peña meteorite. Initially, we collected fragments countryside to determine the[...]texto impreso
We investigate the validity of the weak-Painlevé property as an integrability criterion. We present an example of a time-dependent Hamiltonian system which possesses a weak-Painlevé type expansion, while presenting a chaotic behavior. However, t[...]texto impreso
Barbosa, Alessandra Souza ; Varella, Marcio T. do N. ; Sanchez, Sergio d'A. ; Ameixa, Joao ; Blanco Ramos, Francisco ; García, Gustavo ; Limao Vieira, Paulo ; da Silva, Filipe Ferreira ; Bettega, Marcio H. F. | American Institute of Physics | 2016-08-08In this work, we report theoretical and experimental cross sections for elastic scattering of electrons by chlorobenzene (ClB). The theoretical integral and differential cross sections (DCSs) were obtained with the Schwinger multichannel method [...]texto impreso
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Gregorati, Luca | American Institute of Physics | 2008-05-01In-doped SnO_2 microtubes as well as Sn-doped In_2O_3 (ITO) nano- and microislands have been grown by thermal treatment of compacted SnO_2-In_2O powders under argon flow at 1350 degrees C in a catalyst-free process. The SnO_2 tubes contain about[...]texto impreso
Gómez Nicola, Ángel ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics | 2003We report on our recent work about the description of a meson gas below the chiral phase transition within the framework of Chiral Perturbation Theory. As an alternative to the standard treatment, we present a calculation of the quark condensate[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del | American Institute of Physics | 1999-08-15We analyze the effect of thermal processes on the optical properties (refractive index, optical gap, Tauc coefficient, and Urbach energy) of SiNx:H films. Films with three different nitrogen to silicon ratios (x = 0.97, x = 1.43, and x = 1.55, r[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2002-08-15The bonding configuration, hydrogen evolution, and defect content of rapid thermally annealed (RTA) SiOx:H films of different compositions were studied. Infrared absorption measurements showed that all the hydrogen present in the films is lost a[...]