Detailed balance between impact ionization and auger recombination of trions in GaAs/AlAs quantum wells

A. Manassen; E. Cohen; Arza Ron; E. Linder; L. N. Pfeiffer

doi:10.1006/spmi.1996.0521

Detailed balance between impact ionization and auger recombination of trions in GaAs/AlAs quantum wells

A. Manassen, E. Cohen, Arza Ron, E. Linder, L. N. Pfeiffer

Research output: Contribution to journal › Article › peer-review

Abstract

We studied the photoluminescence of (e1:hh1)1S excitons (X) and negatively charged excitons (trions, X^-) in quantum wells (QWs) having a low density (n_e < 5 × 10¹⁰ cm^-2) two-dimensional electron gas (2DEG). Mixed type I-type II GaAs/AlAs quantum wells are studied in which the 2DEG is photogenerated in the type I QWs and n_e is determined by the excitation intensity. We find that, while for T ≤ 12 K, the X and X^- relative intensities can be described as a system of two levels at equilibrium, it cannot be so described for T ≥ 16 K. The most pronounced difference between the two temperatures is that for n_e < 5 × 10⁹cm^-2, the X^- intensity decreases with increasing n_e in favor of the X intensity. This and other observations are interpreted as due to deviations from the detailed balance between X^- formation and annihilation processes required for thermodynamic equilibrium.

Original language	English (US)
Pages (from-to)	75-78
Number of pages	4
Journal	Superlattices and Microstructures
Volume	24
Issue number	1
DOIs	https://doi.org/10.1006/spmi.1996.0521
State	Published - Jul 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Electrical and Electronic Engineering

Keywords

Excitons
Quantum wells
Trions

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10.1006/spmi.1996.0521

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title = "Detailed balance between impact ionization and auger recombination of trions in GaAs/AlAs quantum wells",

abstract = "We studied the photoluminescence of (e1:hh1)1S excitons (X) and negatively charged excitons (trions, X-) in quantum wells (QWs) having a low density (ne < 5 × 1010 cm-2) two-dimensional electron gas (2DEG). Mixed type I-type II GaAs/AlAs quantum wells are studied in which the 2DEG is photogenerated in the type I QWs and ne is determined by the excitation intensity. We find that, while for T ≤ 12 K, the X and X- relative intensities can be described as a system of two levels at equilibrium, it cannot be so described for T ≥ 16 K. The most pronounced difference between the two temperatures is that for ne < 5 × 109cm-2, the X- intensity decreases with increasing ne in favor of the X intensity. This and other observations are interpreted as due to deviations from the detailed balance between X- formation and annihilation processes required for thermodynamic equilibrium.",

keywords = "Excitons, Quantum wells, Trions",

author = "A. Manassen and E. Cohen and Arza Ron and E. Linder and Pfeiffer, {L. N.}",

year = "1998",

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doi = "10.1006/spmi.1996.0521",

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T1 - Detailed balance between impact ionization and auger recombination of trions in GaAs/AlAs quantum wells

AU - Manassen, A.

AU - Cohen, E.

AU - Ron, Arza

AU - Linder, E.

AU - Pfeiffer, L. N.

PY - 1998/7

Y1 - 1998/7

N2 - We studied the photoluminescence of (e1:hh1)1S excitons (X) and negatively charged excitons (trions, X-) in quantum wells (QWs) having a low density (ne < 5 × 1010 cm-2) two-dimensional electron gas (2DEG). Mixed type I-type II GaAs/AlAs quantum wells are studied in which the 2DEG is photogenerated in the type I QWs and ne is determined by the excitation intensity. We find that, while for T ≤ 12 K, the X and X- relative intensities can be described as a system of two levels at equilibrium, it cannot be so described for T ≥ 16 K. The most pronounced difference between the two temperatures is that for ne < 5 × 109cm-2, the X- intensity decreases with increasing ne in favor of the X intensity. This and other observations are interpreted as due to deviations from the detailed balance between X- formation and annihilation processes required for thermodynamic equilibrium.

AB - We studied the photoluminescence of (e1:hh1)1S excitons (X) and negatively charged excitons (trions, X-) in quantum wells (QWs) having a low density (ne < 5 × 1010 cm-2) two-dimensional electron gas (2DEG). Mixed type I-type II GaAs/AlAs quantum wells are studied in which the 2DEG is photogenerated in the type I QWs and ne is determined by the excitation intensity. We find that, while for T ≤ 12 K, the X and X- relative intensities can be described as a system of two levels at equilibrium, it cannot be so described for T ≥ 16 K. The most pronounced difference between the two temperatures is that for ne < 5 × 109cm-2, the X- intensity decreases with increasing ne in favor of the X intensity. This and other observations are interpreted as due to deviations from the detailed balance between X- formation and annihilation processes required for thermodynamic equilibrium.

KW - Excitons

KW - Quantum wells

KW - Trions

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U2 - 10.1006/spmi.1996.0521

DO - 10.1006/spmi.1996.0521

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JO - Superlattices and Microstructures

JF - Superlattices and Microstructures

IS - 1

ER -

Detailed balance between impact ionization and auger recombination of trions in GaAs/AlAs quantum wells

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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