Hole intersubband relaxation in CdTe/CdMnTe quantum wells

J. P. Likforman; A. Alexandrou; E. Vanelle; J. Cibert

doi:10.1063/1.119646

Hole intersubband relaxation in CdTe/CdMnTe quantum wells

J. P. Likforman
, A. Alexandrou
, E. Vanelle
, J. Cibert

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

Abstract

We report a direct measurement of the hole relaxation time in undoped CdTe/CdMnTe quantum wells. The internal piezoelectric field in a (111)-grown structure is screened by e₁h₁ and e₁h₂ excitons with different efficiency. Thus, the temporal evolution of the screened field, as monitored by the e₁h₁ exciton energy in a pump-probe transmission experiment, allows the determination of the e₁h₂ - e₁h₁ relaxation time. We obtained a relaxation time of 15±5 ps for a splitting of 15 meV, smaller than the longitudinal-optical (LO) phonon energy. Deformation-potential scattering is too slow to explain this relaxation time which we attribute to hole-hole scattering and LO-phonon emission by e₁h₂ excitons acquiring enough kinetic energy.

Original language	English
Pages (from-to)	788-790
Number of pages	3
Journal	Applied Physics Letters
Volume	71
Issue number	6
DOIs	https://doi.org/10.1063/1.119646
Publication status	Published - 11 Aug 1997

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title = "Hole intersubband relaxation in CdTe/CdMnTe quantum wells",

abstract = "We report a direct measurement of the hole relaxation time in undoped CdTe/CdMnTe quantum wells. The internal piezoelectric field in a (111)-grown structure is screened by e1h1 and e1h2 excitons with different efficiency. Thus, the temporal evolution of the screened field, as monitored by the e1h1 exciton energy in a pump-probe transmission experiment, allows the determination of the e1h2 - e1h1 relaxation time. We obtained a relaxation time of 15±5 ps for a splitting of 15 meV, smaller than the longitudinal-optical (LO) phonon energy. Deformation-potential scattering is too slow to explain this relaxation time which we attribute to hole-hole scattering and LO-phonon emission by e1h2 excitons acquiring enough kinetic energy.",

author = "Likforman, \{J. P.\} and A. Alexandrou and E. Vanelle and J. Cibert",

year = "1997",

month = aug,

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doi = "10.1063/1.119646",

language = "English",

volume = "71",

pages = "788--790",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Hole intersubband relaxation in CdTe/CdMnTe quantum wells

AU - Likforman, J. P.

AU - Alexandrou, A.

AU - Vanelle, E.

AU - Cibert, J.

PY - 1997/8/11

Y1 - 1997/8/11

N2 - We report a direct measurement of the hole relaxation time in undoped CdTe/CdMnTe quantum wells. The internal piezoelectric field in a (111)-grown structure is screened by e1h1 and e1h2 excitons with different efficiency. Thus, the temporal evolution of the screened field, as monitored by the e1h1 exciton energy in a pump-probe transmission experiment, allows the determination of the e1h2 - e1h1 relaxation time. We obtained a relaxation time of 15±5 ps for a splitting of 15 meV, smaller than the longitudinal-optical (LO) phonon energy. Deformation-potential scattering is too slow to explain this relaxation time which we attribute to hole-hole scattering and LO-phonon emission by e1h2 excitons acquiring enough kinetic energy.

AB - We report a direct measurement of the hole relaxation time in undoped CdTe/CdMnTe quantum wells. The internal piezoelectric field in a (111)-grown structure is screened by e1h1 and e1h2 excitons with different efficiency. Thus, the temporal evolution of the screened field, as monitored by the e1h1 exciton energy in a pump-probe transmission experiment, allows the determination of the e1h2 - e1h1 relaxation time. We obtained a relaxation time of 15±5 ps for a splitting of 15 meV, smaller than the longitudinal-optical (LO) phonon energy. Deformation-potential scattering is too slow to explain this relaxation time which we attribute to hole-hole scattering and LO-phonon emission by e1h2 excitons acquiring enough kinetic energy.

U2 - 10.1063/1.119646

DO - 10.1063/1.119646

M3 - Article

AN - SCOPUS:5644288747

SN - 0003-6951

VL - 71

SP - 788

EP - 790

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 6

ER -

Hole intersubband relaxation in CdTe/CdMnTe quantum wells

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