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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[...]