Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser

B. E. Cole; C. J G M Langerak; B. N. Murdin; C. D. Bezant; J. M. Chamberlain; C. R. Pidgeon; M. Henini; V. Nakov

Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser

B. E. Cole, C. J G M Langerak, B. N. Murdin, C. D. Bezant, J. M. Chamberlain, C. R. Pidgeon, M. Henini, V. Nakov

School of Engineering & Physical Sciences

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

7 Citations (Scopus)

Abstract

We present saturation absorption studies of the HH1 ? LH1 intersubband transition in a 70 Å p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation time for transitions below the LO-phonon energy. © 1998 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	181-185
Number of pages	5
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	2
Issue number	1-4
Publication status	Published - 15 Jul 1998

Keywords

Energy relaxation
p-type quantum well
Saturation absorption
Terahertz radiation

Cite this

@article{f9976fb5115246cab202636617d57c57,

title = "Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser",

abstract = "We present saturation absorption studies of the HH1 ? LH1 intersubband transition in a 70 {\AA} p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation time for transitions below the LO-phonon energy. {\textcopyright} 1998 Elsevier Science B.V. All rights reserved.",

keywords = "Energy relaxation, p-type quantum well, Saturation absorption, Terahertz radiation",

author = "Cole, {B. E.} and Langerak, {C. J G M} and Murdin, {B. N.} and Bezant, {C. D.} and Chamberlain, {J. M.} and Pidgeon, {C. R.} and M. Henini and V. Nakov",

year = "1998",

month = jul,

day = "15",

language = "English",

volume = "2",

pages = "181--185",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

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TY - JOUR

T1 - Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser

AU - Cole, B. E.

AU - Langerak, C. J G M

AU - Murdin, B. N.

AU - Bezant, C. D.

AU - Chamberlain, J. M.

AU - Pidgeon, C. R.

AU - Henini, M.

AU - Nakov, V.

PY - 1998/7/15

Y1 - 1998/7/15

N2 - We present saturation absorption studies of the HH1 ? LH1 intersubband transition in a 70 Å p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation time for transitions below the LO-phonon energy. © 1998 Elsevier Science B.V. All rights reserved.

AB - We present saturation absorption studies of the HH1 ? LH1 intersubband transition in a 70 Å p-type GaAs/AlGaAs multi-quantum well. The subband separation in this sample, with strongly non-parabolic bands, varies from 26 meV at k = 0 to 16 meV at the Fermi wave vector. The absorption behaviour of this transition is studied over a range of four orders of magnitude of intensity of incident THz radiation. The results are analysed within the contexts of a simple two-level model and an instantaneous thermalization model. The results indicate that the lifetime obtained with these models is limited by the pulsewidth, i.e. is greater than 1.7 ps. This places a lower limit on the energy relaxation time for transitions below the LO-phonon energy. © 1998 Elsevier Science B.V. All rights reserved.

KW - Energy relaxation

KW - p-type quantum well

KW - Saturation absorption

KW - Terahertz radiation

UR - http://www.scopus.com/inward/record.url?scp=0006178768&partnerID=8YFLogxK

M3 - Article

SN - 1386-9477

VL - 2

SP - 181

EP - 185

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-4

ER -

Saturation absorption studies of intersubband relaxation rates in a p-GaAs/AlGaAs QW using a free electron laser

Abstract

Keywords

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