Direct observation of free-exciton thermalization in quantum-well structures

M. Umlauff; J. Hoffmann; H. Kalt; Wolfgang Werner Langbein; Jørn Märcher Hvam; M. Scholl; J. Söllner; M. Heuken; B. Jobst; D. Hommel

doi:10.1103/PhysRevB.57.1390

Direct observation of free-exciton thermalization in quantum-well structures

M. Umlauff, J. Hoffmann, H. Kalt, Wolfgang Werner Langbein, Jørn Märcher Hvam, M. Scholl, J. Söllner, M. Heuken, B. Jobst, D. Hommel

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Abstract

We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum stales with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.

Original language	English
Journal	Physical Review B
Volume	57
Issue number	3
Pages (from-to)	1390-1393
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.57.1390
Publication status	Published - 1998

Bibliographical note

Copyright (1998) by the American Physical Society.

Keywords

QUASI-2-DIMENSIONAL EXCITONS
MOLECULAR-BEAM EPITAXY
ENERGY RELAXATION
DYNAMICS

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title = "Direct observation of free-exciton thermalization in quantum-well structures",

abstract = "We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum stales with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.",

keywords = "QUASI-2-DIMENSIONAL EXCITONS, MOLECULAR-BEAM EPITAXY, ENERGY RELAXATION, DYNAMICS",

author = "M. Umlauff and J. Hoffmann and H. Kalt and Langbein, {Wolfgang Werner} and Hvam, {J{\o}rn M{\"a}rcher} and M. Scholl and J. S{\"o}llner and M. Heuken and B. Jobst and D. Hommel",

note = "Copyright (1998) by the American Physical Society.",

year = "1998",

doi = "10.1103/PhysRevB.57.1390",

language = "English",

volume = "57",

pages = "1390--1393",

journal = "Physical Review B",

issn = "2469-9950",

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TY - JOUR

T1 - Direct observation of free-exciton thermalization in quantum-well structures

AU - Umlauff, M.

AU - Hoffmann, J.

AU - Kalt, H.

AU - Langbein, Wolfgang Werner

AU - Hvam, Jørn Märcher

AU - Scholl, M.

AU - Söllner, J.

AU - Heuken, M.

AU - Jobst, B.

AU - Hommel, D.

PY - 1998

Y1 - 1998

N2 - We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum stales with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.

AB - We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum stales with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.

KW - QUASI-2-DIMENSIONAL EXCITONS

KW - MOLECULAR-BEAM EPITAXY

KW - ENERGY RELAXATION

KW - DYNAMICS

U2 - 10.1103/PhysRevB.57.1390

DO - 10.1103/PhysRevB.57.1390

M3 - Journal article

SN - 2469-9950

VL - 57

SP - 1390

EP - 1393

JO - Physical Review B

JF - Physical Review B

IS - 3

ER -

Direct observation of free-exciton thermalization in quantum-well structures

Abstract

Bibliographical note

Keywords

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