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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Intraband absorption in GaAs-(Ga,Al) As variably spaced semiconductor superlattices under crossed electric and magnetic fields

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Author(s):
Reyes-Gomez, E. [1] ; Raigoza, N. [1] ; Oliveira, L. E. [2]
Total Authors: 3
Affiliation:
[1] Univ Antioquia UdeA, Fac Ciencias Exactas & Nat, Inst Fis, Medellin - Colombia
[2] Univ Estadual Campinas UNICAMP, Inst Fis, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: EPL; v. 104, n. 4 NOV 2013.
Web of Science Citations: 2
Abstract

A theoretical study of the intraband absorption properties of GaAs-Ga1-xAlxAs variably spaced semiconductor superlattices under crossed magnetic and electric fields is presented. Calculations are performed for the applied electric field along the growth-axis direction, whereas the magnetic field is considered parallel to the heterostructure layers. By defining a critical electric field so that the heterostructure energy levels are aligned in the absence of the applied magnetic fields, one finds that, in the weak magnetic-field regime, an abrupt red shift of the absorption coefficient maxima is obtained at fields equal to or larger than the critical electric field, a fact which may be explained from the localization properties of the electron wave functions. Results in the strong magnetic-field regime reveal a rich structure on the intraband absorption coefficient which may be explained from the strong dispersion exhibited by both the energy levels and transition strengths as functions of the generalized orbit-center position. Moreover, the possibility of occurrence of absorption in a wide frequency range is also demonstrated. Present calculated results may be of interest for future design and improvement of multilayered-based photovoltaic and solar-cell devices. Copyright (C) EPLA, 2013 (AU)

FAPESP's process: 12/51691-0 - The physics of new materials and semiconductor nanostructures
Grantee:Luiz Eduardo Moreira Carvalho de Oliveira
Support type: Research Projects - Thematic Grants