Spin transverse separation in a two-dimensional electron-gas using an external magnetic field with a topological chirality

作     者：S. G. Tan M. B. A. Jalil Xiong-Jun Liu T. Fujita 

作者机构：Data Storage Institute Agency for Science Technology and Research (A*STAR) DSI Building 5 Engineering Drive 1 Singapore 117608 Singapore Department of Electrical and Computer Engineering Information Storage Materials Laboratory National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore 

出 版 物：《Physical Review B》 (物理学评论B辑：凝聚态物质与材料物理学)

年 卷 期：2008年第78卷第24期

页      面：245321-245321页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National University of Singapore (NUS) [WBS: R-398-000-047-123, WBS: R-144-000-172-101] Data Storage Institute 

主　　题：spin-orbit interactions two-dimensional electron gas 

摘      要：We propose a two-dimensional electron-gas (2DEG) system in which an external magnetic field with a small chirality is applied to provide a topological spin gauge field that separates conduction electrons of opposite spins in the transverse direction. Additionally, the vertical electric field in the 2DEG, together with spin-orbit coupling, produces a SU(2) gauge field which reinforces or opposes the effect of the spin gauge. The system thus provides a tunable spin separation effect, where an applied gate voltage on the 2DEG can be used to modulate the transverse spin current. As this method leads to the enhancement or cancellation of spin separation due to the intrinsic spin-orbit coupling effect only, it may naturally distinguish the extrinsic effect from the intrinsic one.