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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|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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