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Title: Negatively charged excitons and photoluminescence in asymmetric quantum wells

Abstract

We study photoluminescence (PL) of charged excitons (X{sup -}) in narrow asymmetric quantum wells in high magnetic fields B. The binding of all X{sup -} states strongly depends on the separation {delta} of electron and hole layers. The most sensitive is the ''bright'' singlet, whose binding energy decreases quickly with increasing {delta} even at relatively small B. As a result, the value of B at which the singlet-triplet crossing occurs in the X{sup -} spectrum also depends on {delta}, and decreases from 35 T in a symmetric 10 nm GaAs well to 16 T for {delta}=0.5 nm. Since the critical values of {delta} at which different X{sup -} states unbind are surprisingly small compared to the well width, the observation of strongly bound X{sup -} states in an experimental PL spectrum implies virtually no layer displacement in the sample. This casts doubt on the interpretation of PL spectra of heterojunctions in terms of X{sup -} recombination.

Authors:
; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205568
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 63; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevB.63.085305; Othernumber: PRBMDO000063000008085305000001; 030108PRB; PBD: 15 Feb 2001; Journal ID: ISSN 0163-1829
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BINDING ENERGY; ELECTRONS; EXCITONS; HETEROJUNCTIONS; MAGNETIC FIELDS; PHOTOLUMINESCENCE; RECOMBINATION; SPECTRA

Citation Formats

Szlufarska, Izabela, Wojs, Arkadiusz, and Quinn, John J. Negatively charged excitons and photoluminescence in asymmetric quantum wells. United States: N. p., 2001. Web. doi:10.1103/PhysRevB.63.085305.
Szlufarska, Izabela, Wojs, Arkadiusz, & Quinn, John J. Negatively charged excitons and photoluminescence in asymmetric quantum wells. United States. https://doi.org/10.1103/PhysRevB.63.085305
Szlufarska, Izabela, Wojs, Arkadiusz, and Quinn, John J. 2001. "Negatively charged excitons and photoluminescence in asymmetric quantum wells". United States. https://doi.org/10.1103/PhysRevB.63.085305.
@article{osti_40205568,
title = {Negatively charged excitons and photoluminescence in asymmetric quantum wells},
author = {Szlufarska, Izabela and Wojs, Arkadiusz and Quinn, John J},
abstractNote = {We study photoluminescence (PL) of charged excitons (X{sup -}) in narrow asymmetric quantum wells in high magnetic fields B. The binding of all X{sup -} states strongly depends on the separation {delta} of electron and hole layers. The most sensitive is the ''bright'' singlet, whose binding energy decreases quickly with increasing {delta} even at relatively small B. As a result, the value of B at which the singlet-triplet crossing occurs in the X{sup -} spectrum also depends on {delta}, and decreases from 35 T in a symmetric 10 nm GaAs well to 16 T for {delta}=0.5 nm. Since the critical values of {delta} at which different X{sup -} states unbind are surprisingly small compared to the well width, the observation of strongly bound X{sup -} states in an experimental PL spectrum implies virtually no layer displacement in the sample. This casts doubt on the interpretation of PL spectra of heterojunctions in terms of X{sup -} recombination.},
doi = {10.1103/PhysRevB.63.085305},
url = {https://www.osti.gov/biblio/40205568}, journal = {Physical Review B},
issn = {0163-1829},
number = 8,
volume = 63,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2001},
month = {Thu Feb 15 00:00:00 EST 2001}
}