Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-05-14
J. Appl. Phys. 101, 09D513 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3 pages, 2 figures, appears in the proceedings of 10th MMM/INTERMAG conference
Scientific paper
10.1063/1.2712541
The spin-Hall effect in the two-dimensional electron gas (2DEG) generates symmetric out-of-plane spin Sz accumulation about the current axis in the absence of external magnetic field. Here we employ the real space Landauer-Keldysh formalism [B. K. Nikolic et al., Phys. Rev. Lett. 95, 046601 (2005); Phys. Rev. B 73, 075303 (2006)] by considering a four-terminal setup to investigate the circumstances in which this symmetry is broken. For the absence of Dresselhaus interaction, starting from the applied out-of-plane B corresponding to Zeeman splitting energy 0 - 0.5 times the Rashba hopping energy tR, the breaking process is clearly seen. The influence of the Rashba interaction on the magnetization of the 2DEG is studied herein. For coexisted Rashba tR and Dresselhaus tD spin-orbit couplings in the absence of B, interchanging tR and tD reverses the entire accumulation pattern.
Chang Ching-Ray
Chen Kuo-Wei
Chen Son-Hsien
Liu Ming-Hao
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