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Many-Body Effects in Quantum-Well Intersubband TransitionsIntersubband polarization couples to collective excitations of the interacting electron gas confined in a semiconductor quantum well (Qw) structure. Such excitations include correlated pair excitations (repellons) and intersubband plasmons (ISPs). The oscillator strength of intersubband transitions (ISBTs) strongly varies with QW parameters and electron density because of this coupling. We have developed a set of kinetic equations, termed the intersubband semiconductor Bloch equations (ISBEs), from density matrix theory with the Hartree-Fock approximation, that enables a consistent description of these many-body effects. Using the ISBEs for a two-conduction-subband model, various many-body effects in intersubband transitions are studied in this work. We find interesting spectral changes of intersubband absorption coefficient due to interplay of the Fermi-edge singularity, subband renormalization, intersubband plasmon oscillation, and nonparabolicity of bandstructure. Our results uncover a new perspective for ISBTs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBT line shape.
Document ID
20030107318
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Li, Jian-Zhong
(NASA Ames Research Center Moffett Field, CA, United States)
Ning, Cun-Zheng
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Solid-State Physics
Funding Number(s)
CONTRACT_GRANT: DTTS59-99-D-00437
CONTRACT_GRANT: NASA Order A-61812-D
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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