Spin-splitting surface states of strained GaAs(001) and spontaneous spin current from breaking of twofold symmetry

被引：0
作者：
Iijima, Tomonori
机构：
[1] 3028-1-312 Nogawa, Miyamae-ku, Kawasaki, Kanagawa
来源：
RESULTS IN PHYSICS | 2015年 / 5卷
关键词：
Spin splitting; Spin current; Strain-induced spin-orbit coupling; OPTICAL ANISOTROPY; SEMICONDUCTORS; HETEROSTRUCTURES; DEFORMATION; ASYMMETRY; INTERFACE; BAND;
D O I：
10.1016/j.rinp.2015.08.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We theoretically study the electronic structure and spin splitting of a strained GaAs(001) surface with broken twofold symmetry. We introduce a surface electron Hamiltonian of our model. By k . p theory, we qualitatively evaluate the electronic structure of GaAs(001) surface, demonstrating that the spin degeneracy of the bottom of the surface-state conduction bands is split. Additionally, by the spin current operator, we evaluate the spin current of electrons in the bottom of the surface-state conduction bands, demonstrating that for n-type GaAs the spin current flows in the parallel direction to a mirror plane spontaneously. This is a new mechanism to generate the spin current. (C) 2015 The Author. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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页码：224 / 227
页数：4
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