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arXiv 0912.4658cond-mat.mes-hall
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手征电子系统中的自旋霍尔效应:从半导体异质结构到拓扑绝缘体

Spin-Hall Effect in Chiral Electron Systems: from Semiconductor Heterostructures to Topological Insulators

P. G. Silvestrov, E. G. Mishchenko

摘要:

介观自旋-霍尔效应现象表现为在弹道导体的边缘或更一般地在具有变化的电子密度的区域中的非平衡自旋积累(由电流驱动)。本文回顾了我们最近对具有Rashba/Dresselhaus自旋轨道相互作用的弹道二维半导体异质结构中自旋积累的研究结果,并将以前发展的方法推广到预测三维拓扑绝缘体表面自旋-霍尔效应的存在.新的自旋-霍尔效应的主要区别在于它的大小,预计比半导体异质结构中的强得多。这是因为在半导体中,由于小的自旋-轨道相互作用而出现自旋累积,而自旋-轨道构成拓扑绝缘体的哈密顿量中的主导项。

英文摘要:

The phenomenon of mesoscopic Spin-Hall effect reveals in a nonequilibrium spin accumulation (driven by electric current) at the edges of a ballistic conductor or, more generally, in the regions with varying electron density. In this paper we review our recent results on spin accumulation in ballistic two-dimensional semiconductor heterostructures with Rashba/Dresselhaus spin orbit interactions, and extend the method developed previously to predict the existince of spin-Hall effect on the surface of three-dimensional topological insulators. The major difference of the new Spin-Hall effect is its magnitude, which is predicted to be much stronger than in semiconductor heterostructures. This happens because in semiconductors the spin accumulation appears due to a small spin-orbit interaction, while the spin-orbit constitutes a leading term in the Hamiltonian of topological insulator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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