Issue
EPL
Volume 82, Number 6, June 2008
Article Number 67003
Number of page(s) 4
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/82/67003
Published online 03 June 2008
EPL, 82 (2008) 67003
DOI: 10.1209/0295-5075/82/67003

Temperature dependence of the intrinsic spin Hall effect in Rashba spin-orbit coupled systems

Zhou Li1, Zhongshui Ma1 and Chao Zhang2

1  School of Physics, Peking University - Beijing 100871, China
2  School of Engineering Physics, University of Wollongong - New South Wales 2552, Australia

czhang@uow.edu.au

received 26 February 2008; accepted in final form 29 April 2008; published June 2008
published online 3 June 2008

Abstract
We investigate the temperature dependence of the intrinsic charge and spin transport in two-dimensional semiconductors with Rashba spin-orbit coupling. For 2$\alpha$ kF0-2m$\alpha$2/$\hbar$2 < $\hbar$ $\omega$ < 2$\alpha$ kF0+2m$\alpha$2/$\hbar$2 (where $\alpha$ is the Rashba spin-orbit coupling parameter), the real part of the optical conductivity ($\sigma$R($\omega$)) and the imaginary part of the spin Hall conductivity ($\sigma$IsH($\omega$)) decrease with temperature monotonically. Outside this frequency range, $\sigma$R($\omega$) and $\sigma$IsH($\omega$) exhibit resonant behavior. At high frequencies, $\sigma$RsH($\omega$) changes sign at a characteristic temperature T1. Our result suggests that the sign and magnitude of $\sigma$RsH($\omega$) can be tuned by changing the temperature.

PACS
71.10.Ca - Electron gas, Fermi gas.
72.25.-b - Spin polarized transport.
73.23.-b - Electronic transport in mesoscopic systems.

© EPLA 2008