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arXiv 0709.0079cond-mat.mes-hall
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非阿贝尔自旋轨道规范:持续自旋螺旋和量子方环

Non-Abelian spin-orbit gauge: Persistent spin helix and quantum square ring

Son-Hsien Chen, Ching-Ray Chang

摘要:

我们重新表达Rashba和Dresselhaus相互作用作为非阿贝尔自旋轨道规范,并提供了一个新的视角,在理解持久的自旋螺旋[物理。97,236601(2006)]。在等强度Rashba-Dresselhaus [001]线性模型、Dresselhaus [110]线性模型和一维系统中,自旋-轨道相互作用系统可以转化为自由电子气体。利用有限差分方法,得到了非均匀自旋轨道相互作用和任意方向跳跃的一般紧束缚哈密顿量。作为一个应用的基础上,该哈密顿量,量子方环接触两个理想的铅被发现表现出四个状态,绝缘,自旋过滤,自旋翻转,和自旋保持状态。

英文摘要:

We re-express the Rashba and Dresselhaus interactions as non-Abelian spin-orbit gauges and provide a new perspective in understanding the persistent spin helix [Phys. Rev. Lett. 97, 236601 (2006)]. A spin-orbit interacting system can be transformed into a free electron gas in the equal-strength Rashba-Dresselhaus [001] linear model, the Dresselhaus [110] linear model, and a one-dimensional system. A general tight-binding Hamiltonian for non-uniform spin-orbit interactions and hoppings along arbitrary directions, within the framework of finite difference method, is obtained. As an application based on this Hamiltonian, a quantum square ring in contact with two ideal leads is found to exhibit four states, insulating, spin-filtering, spin-flipping, and spin-keeping states.

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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