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Autor Maciá Barber, Enrique Alfonso |
Documentos disponibles escritos por este autor (55)
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Roche, S. ; Bicout, D. ; Maciá Barber, Enrique Alfonso ; Kats, E. | American Physical Society | 2003-10-28We address the relation between long-range correlations and charge transfer efficiency in aperiodic artificial or genomic DNA sequences. Coherent charge transfer through the highest occupied molecular orbital states of the guanine nucleotide is [...]texto impreso
We present a theoretical analysis of quasicrystals (QCs) as potential thermoelectric materials. We consider a self-similar density of states model and extend the framework introduced in [G. D. Mahan and J. O. Sofo, Proc. Natl. Acad. Sci. U.S.A. [...]texto impreso
A model for the electronic structure of icosahedral quasicrystals is proposed on the basis of a number of pertinent experimental results. From this model we obtain a closed analytical expression for the electrical conductivity accurately describ[...]texto impreso
Maciá Barber, Enrique Alfonso ; Takeuchi, Tsunehiro ; Otagiri, Toshio | American Physical Society | 2005-11The electronic structure of a quasicrystalline approximant sample is analyzed by means of a combined study of different experimental transport curves within a phenomenological approach. The main features of the obtained spectral conductivity are[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Méndez Martín, Bianchi ; Maciá Barber, Enrique Alfonso ; González, M. A. | Taylor & Francis Ltd | 1991-12-10It is shown that nonlocal separable potentials may be used to study bound states of particles in multicentre potentials. The binding energy is obtained in a closed form. The cases of H_2+ ion and polymer chains are discussed in detail and result[...]texto impreso
Domínguez-Adame Acosta, Francisco ; Maciá Barber, Enrique Alfonso ; Sánchez, Angel | American Physical Society | 1994-09-01Optical absorption in a random one-dimensional lattice in the presence of paired correlated disorder is studied. The absorption line shape is evaluated by solving the microscopic equations of motion of the Frenkel-exciton problem in the lattice.[...]texto impreso
In this work we analyze the potential role of quasicrystals and related alloys in thermoelectric material research. Relatively large figure of merit values are expected for those samples exhibiting two properly located narrow features in the den[...]texto impreso
The presence of synchronized, collective twist motions of the Watson-Crick base pairs in DNA duplexes (helicoidal standing waves) can efficiently enhance the pi-pi orbital overlapping between nonconsecutive base pairs via a long-range, phonon-co[...]texto impreso
We report on the possibility of modulating the transport properties of critical normal modes in Fibonacci quasicrystals by using the mass ratio as a tuning parameter. The relationship between the spatial structure and the transport properties of[...]texto impreso
Maciá Barber, Enrique Alfonso ; Domínguez-Adame Acosta, Francisco | American Physical Society | 1996-04-15We report on a new class of critical states in the energy spectrum of general Fibonacci systems. By introducing a transfer matrix renormalization technique, we prove that the charge distribution of these states spreads over the whole system, sho[...]texto impreso
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In this work we introduce a similarity transformation acting on transfer matrices describing the propagation of elementary excitations through either periodic or Fibonacci lattices. The proposed transformation can act at two different scale leng[...]texto impreso
A spectral classification of general one-dimensional binary aperiodic crystals (BACs) based on both their diffraction patterns and energy spectrum measures is introduced along with a systematic comparison of the zeroth-order energy spectrum main[...]texto impreso
Sáchez, A. ; Maciá Barber, Enrique Alfonso ; Domínguez-Adame Acosta, Francisco | American Physical Society | 1994-01-01We consider the electron dynamics and transport properties of one-dimensional continuous models with random, short-range correlated impurities. We develop a generalized Poincare map formalism to cast the Schrodinger equation for any potential in[...]texto impreso
The validity of the Wiedemann-Franz law (WFL) for icosahedral quasicrystals belonging to the families AlCu(Fe,Ru) and AlPd(Mn,Re) is discussed. We exploit some characteristic features in the electronic structure in order to obtain closed analyti[...]