Many-body effects on intersubband resonances in narrow InAs/AlSb quantum wells

Jianzhong Li, Cun-Zheng Ning

Research output: Contribution to journalArticle

Abstract

Intersubband 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. The oscillator strength of intersubband resonances (ISBRs) strongly varies with QW parameters and electron density because of this coupling. Using the intersubband semiconductor Bloch equations for a two-conduction-subband model, we show that intersubband absorption spectra for narrow wells are dominated by the Fermi-edge singularity (via coupling to repellons) when the electron gas becomes degenerate and in the presence of large nonparabolicity. Thus the resonance peak position appears at the Fermi edge and the peak is greatly narrowed, enhanced, and red shifted as compared to the free particle result. Our results uncover a new perspective for ISBRs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBR line shape.

Original languageEnglish (US)
Pages (from-to)264-267
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume20
Issue number3-4
DOIs
StatePublished - Jan 2004
Externally publishedYes

Fingerprint

Semiconductor quantum wells
quantum wells
Electron gas
electron gas
excitation
plasmons
resonance lines
oscillator strengths
Plasmons
line shape
Carrier concentration
absorption spectra
conduction
Absorption spectra
polarization
Polarization
Semiconductor materials
predictions
indium arsenide

Keywords

  • Intersubband resonance
  • Many-body effects
  • Nonparabolicity
  • Quantum wells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Many-body effects on intersubband resonances in narrow InAs/AlSb quantum wells. / Li, Jianzhong; Ning, Cun-Zheng.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 20, No. 3-4, 01.2004, p. 264-267.

Research output: Contribution to journalArticle

@article{8f48e778d6ef480ab3e16a3666c346df,
title = "Many-body effects on intersubband resonances in narrow InAs/AlSb quantum wells",
abstract = "Intersubband 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. The oscillator strength of intersubband resonances (ISBRs) strongly varies with QW parameters and electron density because of this coupling. Using the intersubband semiconductor Bloch equations for a two-conduction-subband model, we show that intersubband absorption spectra for narrow wells are dominated by the Fermi-edge singularity (via coupling to repellons) when the electron gas becomes degenerate and in the presence of large nonparabolicity. Thus the resonance peak position appears at the Fermi edge and the peak is greatly narrowed, enhanced, and red shifted as compared to the free particle result. Our results uncover a new perspective for ISBRs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBR line shape.",
keywords = "Intersubband resonance, Many-body effects, Nonparabolicity, Quantum wells",
author = "Jianzhong Li and Cun-Zheng Ning",
year = "2004",
month = "1",
doi = "10.1016/j.physe.2003.08.015",
language = "English (US)",
volume = "20",
pages = "264--267",
journal = "Physica E: Low-Dimensional Systems and Nanostructures",
issn = "1386-9477",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Many-body effects on intersubband resonances in narrow InAs/AlSb quantum wells

AU - Li, Jianzhong

AU - Ning, Cun-Zheng

PY - 2004/1

Y1 - 2004/1

N2 - Intersubband 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. The oscillator strength of intersubband resonances (ISBRs) strongly varies with QW parameters and electron density because of this coupling. Using the intersubband semiconductor Bloch equations for a two-conduction-subband model, we show that intersubband absorption spectra for narrow wells are dominated by the Fermi-edge singularity (via coupling to repellons) when the electron gas becomes degenerate and in the presence of large nonparabolicity. Thus the resonance peak position appears at the Fermi edge and the peak is greatly narrowed, enhanced, and red shifted as compared to the free particle result. Our results uncover a new perspective for ISBRs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBR line shape.

AB - Intersubband 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. The oscillator strength of intersubband resonances (ISBRs) strongly varies with QW parameters and electron density because of this coupling. Using the intersubband semiconductor Bloch equations for a two-conduction-subband model, we show that intersubband absorption spectra for narrow wells are dominated by the Fermi-edge singularity (via coupling to repellons) when the electron gas becomes degenerate and in the presence of large nonparabolicity. Thus the resonance peak position appears at the Fermi edge and the peak is greatly narrowed, enhanced, and red shifted as compared to the free particle result. Our results uncover a new perspective for ISBRs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBR line shape.

KW - Intersubband resonance

KW - Many-body effects

KW - Nonparabolicity

KW - Quantum wells

UR - http://www.scopus.com/inward/record.url?scp=0345868274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0345868274&partnerID=8YFLogxK

U2 - 10.1016/j.physe.2003.08.015

DO - 10.1016/j.physe.2003.08.015

M3 - Article

VL - 20

SP - 264

EP - 267

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

SN - 1386-9477

IS - 3-4

ER -