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Type: Artigo de periódico
Title: Infrared photocurrent with one- and two-photon absorptions in a double-barrier quantum well system
Author: Degani, MH
Maialle, MZ
Farinas, PF
Studart, N
Abstract: We present a theoretical investigation of a double-barrier quantum-well infrared photodetector (QWIP) having two-color selectivity. The quantum well is placed between a pair of potential barriers in order to increase selectivity through modulation of the continuum states. This also leads to a potential decrease in the dark current. Calculations are carried in the effective-mass approximation using a single-electron hamiltonian. The approach used to obtain the photocurrent yields the observation of single as well as many-photon transitions in a unified manner, by naturally accounting for real and virtual processes through intermediate states that take part in the generation of photocurrent. The two-color selectivity of the calculated photocurrent spectra comes from both one-and two-photon transitions. The performance of the system studied is compared to the results for the isolated quantum well and the advantages of the double barrier are pointed out. (C) 2011 American Institute of Physics. [doi:10.1063/1.3662867]
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.3662867
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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