University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Direct Monitoring of the Excited State Population in Biased SiGe Valence Band Quantum Wells by Femtosecond Resolved Photocurrent Experiments

Rauter, P, Fromherz, T, Bauer, G, Vinh, N Q, Murdin, B N, Phillips, J P, Pidgeon, C R, Diehl, L, Dehlinger, G and Grutzmacher, D (2006) Direct Monitoring of the Excited State Population in Biased SiGe Valence Band Quantum Wells by Femtosecond Resolved Photocurrent Experiments Applied Physics Letters, 89 (21). ISSN 00036951

[img]
Preview
PDF
fulltext.pdf

Download (344Kb)

Abstract

The authors report a direct measurement of the optical phonon intersubband hole relaxation time in a SiGe heterostructure and a quantitative determination of hole relaxation under electrically active conditions. The results were obtained by femtosecond resolved pump-pump photocurrent experiments using a free electron laser (wavelength 7.9 mu m). Additionally, the intensity dependence of the nonlinear photocurrent response was measured. Both types of experiments were simulated using a density matrix description. With one parameter set, a consistent modeling was achieved confirming the significance of the extracted heavy hole relaxation times. For an intersublevel spacing of 160 meV, a value of 550 fs was obtained. (c) 2006 American Institute of Physics.

Item Type: Article
Additional Information: Published in <i>Applied Physics Letters,</i> Vol. 89, Iss. 21. Copyright 2006 American Institute of Physics. Click <a href=http://apl.aip.org/>here</a> to access the journal's webpage.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/449

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800