Schneider, Petra and Kainz, Josef and Ganichev, Sergey and Danilov, Sergey and Rössler, Ulrich and Wegscheider, Werner and Weiss, Dieter and Prettl, Wilhelm and Belkov, Vassilij and Glazov, M. and Golub, Leonid E. and Schuh, Dieter
Spin relaxation times of two-dimensional holes from spin sensitive bleaching of intersubband absorption.
Journal of Applied Physics 96 (1), pp. 420-424.
We present spin relaxation times of two-dimensional holes obtained by spin sensitive bleaching of the absorption of infrared radiation in p-type GaAs/AlGaAs quantum wells (QWs). It is shown that the saturation of intersubband absorption of circularly polarized radiation is mainly controlled by the spin relaxation time of the holes. The saturation behavior has been determined for different QW widths and in a wide range of temperatures with the result that the saturation intensity substantially decreases with narrowing of the QWs. Spin relaxation times are derived from the measured saturation intensities by making use of calculated (linear) absorption coefficients for direct intersubband transitions. It is shown that spin relaxation is due to the D'yakonov–Perel' mechanism governed by hole–hole scattering. The problem of selection rules is addressed.
|Date:||1 July 2004|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|73.25.+i; 72.25.Dc; 78.66.Fd; 68.65.Fg; 78.67.De; 76.60.Es||PACS|
|Keywords:||aluminium compounds, gallium arsenide, III-V semiconductors, two-dimensional hole gas, semiconductor quantum wells, absorption coefficients, spin-spin relaxation, spin polarised transport|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||11 Jan 2010 13:06|
|Last Modified:||20 Jul 2011 22:13|