Volume 83, Number 4, August 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 August 2008|
Spin dynamics in the second subband of a quasitwo-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences - P.O. Box 912, Beijing 100083, China
Corresponding author: firstname.lastname@example.org
Accepted: 25 June 2008
Spin dynamics in the first and second subbands have been examined simultaneously by time resolved Kerr rotation in a single-barrier heterostructure of a 500 nm thick GaAs absorption layer. By scanning the wavelengths of the probe and pump beams towards the short wavelength in the zero magnetic field, the spin coherent time in the subband E1 decreases in accordance with the D'yakonov-Perel' (DP) spin decoherence mechanism. Meanwhile, the spin coherence time in the subband E2 remains very low at wavelengths longer than 810 nm, and then is dramatically enhanced afterwards. At 803 nm, becomes ten times longer than . A new feature has been discovered at the wavelength of 811 nm under the bias of (807 nm under the bias of ) that the spin coherence times ( and ) and the effective g* factors ( and ) all display a sudden change, presumably due to the “resonant" spin exchange coupling between two spin opposite bands.
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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