Issue |
EPL
Volume 83, Number 4, August 2008
|
|
---|---|---|
Article Number | 47006 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/83/47006 | |
Published online | 06 August 2008 |
Electrical control of dynamic spin splitting induced by exchange interaction as revealed by time-resolved Kerr rotation in a degenerate spin-polarized electron gas
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences - P.O. Box 912, Beijing 100083, China
Corresponding author: hzzheng@red.semi.ac.cn
Received:
27
March
2008
Accepted:
25
June
2008
Manipulation of the spin degree of freedom has been demonstrated in a spin-polarized electron plasma in a heterostructure by using exchange-interactioninduced dynamic spin splitting rather than the Rashba and Dresselhaus types, as revealed by time-resolved Kerr rotation. The measured spin splitting increases from 0.256 meV to 0.559 meV as the bias varies from V to -0.6 V. Both the sign switch of the Kerr signal and the phase reversal of Larmor precessions have been observed with biases, which all fit into the framework of exchange-interactioninduced spin splitting. The electrical control of it may provide a new effective scheme for manipulating spin-selected transport in spin FET-like devices.
PACS: 72.25.Fe – Optical creation of spin polarized carriers / 72.25.Dc – Spin polarized transport in semiconductors / 78.47.-p – Spectroscopy of solid state dynamics
© EPLA, 2008
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