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Type: Artigo de periódico
Title: Intraband Absorption In Gaas-(ga,al)as Variably Spaced Semiconductor Superlattices Under Crossed Electric And Magnetic Fields
Author: Reyes-Gomez E.
Raigoza N.
Oliveira L.E.
Abstract: A theoretical study of the intraband absorption properties of GaAs-Ga 1-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. © 2013 EPLA.
Citation: Epl. , v. 104, n. 4, p. - , 2013.
Rights: aberto
Identifier DOI: 10.1209/0295-5075/104/47008
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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