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Publisher: American Physical Society

Issued date: 1996-11-15

Citation: Physical Review B, vol. 54, n. 20, 15 nov. 1996. Pp. 14550–14559

ISSN: 1098-0121 print version1550-235X online version

DOI: 10.1103-PhysRevB.54.14550

Sponsor: Work at Leganes and Madrid is supported by the Comisión Interministerial de Ciencia y Tecnología CICyT, Spain under Grant No. MAT95-0325. G. P. B. gratefully acknowledges partial support from Linkage Grant No. 93-1602 from NATO Special Programme Panel on Nanotechnology.

Publisher version: http:-dx.doi.org-10.1103-PhysRevB.54.14550

Abstract:We study the dynamical behavior of disordered quantum well-based semiconductor superlattices where thedisorder is intentional and short-range correlated. We show that, whereas the transmission time of a particlegrows exponentially with the number of wells inWe study the dynamical behavior of disordered quantum well-based semiconductor superlattices where thedisorder is intentional and short-range correlated. We show that, whereas the transmission time of a particlegrows exponentially with the number of wells in an usual disordered superlattice for any value of the incidentparticle energy, for specific values of the incident energy this time increases linearly when correlated disorderis included. As expected, those values of the energy coincide with a narrow subband of extended statespredicted by the static calculations of Domınguez-Adame et al. @Phys. Rev. B 51, 14 359 ~1994!#; such statesare seen in our dynamical results to exhibit a ballistic regime, very close to the WKB approximation of aperfect superlattice. Fourier transform of the output signal for an incident Gaussian wave packet reveals adramatic filtering of the original signal, which makes us confident that devices based on this property may bedesigned and used for nanotechnological applications. This is more so in view of the possibility of controllingthe output band using a dc-electric field, which we also discuss. In the conclusion we summarize our resultsand present an outlook for future developments arising from this work. S0163-1829~96!02943-8+-





Autor: Diez, Enrique; Sánchez, Angel; Berman, Gennady P.

Fuente: http://e-archivo.uc3m.es


Introducción



Universidad Carlos III de Madrid Repositorio institucional e-Archivo http:--e-archivo.uc3m.es Grupo Interdisciplinar de Sistemas Complejos (GISC) DM - GISC - Artículos de Revistas 1996-11-15 Electron dynamics in intentionally disordered semiconductor superlattices Diez, Enrique American Physical Society þÿPhysical Review B, vol.
54, n.
20, 15 nov.
1996.
Pp.
14550 14559 http:--hdl.handle.net-10016-15305 Descargado de e-Archivo, repositorio institucional de la Universidad Carlos III de Madrid PHYSICAL REVIEW B VOLUME 54, NUMBER 20 15 NOVEMBER 1996-II Electron dynamics in intentionally disordered semiconductor superlattices Enrique Diez and Angel Sánchez Departamento de Matemáticas, Escuela Politécnica Superior, Universidad Carlos III, E-28911 Leganés, Madrid, Spain Francisco Domı́nguez-Adame Departamento de Fı́sica de Materiales, Facultad de Fı́sicas, Universidad Complutense, E-28040 Madrid, Spain Gennady P.
Berman Theoretical Division and CNLS, B213, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 ~Received 23 January 1996; revised manuscript received 20 May 1996! We study the dynamical behavior of disordered quantum well-based semiconductor superlattices where the disorder is intentional and short-range correlated.
We show that, whereas the transmission time of a particle grows exponentially with the number of wells in an usual disordered superlattice for any value of the incident particle energy, for specific values of the incident energy this time increases linearly when correlated disorder is included.
As expected, those values of the energy coincide with a narrow subband of extended states predicted by the static calculations of Domı́nguez-Adame et al.
@Phys.
Rev.
B 51, 14 359 ~1994!#; such states are seen in our dynamical results to exhibit a ballistic regime, very close to the WKB approximation of a perfect superlattice.
Fourier transform of the output signal for an incident Gaussian wave packet reveals a dramatic fi...





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