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arXiv 1401.0262cond-mat.mes-hall
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用格林函数技术研究量子环中的持续电荷和自旋电流:磁通量和自旋轨道相互作用之间的相互作用

Persistent charge and spin currents in a quantum ring using Green's function technique: Interplay between magnetic flux and spin-orbit interactions

Santanu K. Maiti, Moumita Dey, S. N. Karmakar

摘要:

本文提出了一种基于格林函数的方法来精确计算受Rashba和Dresselhaus自旋轨道相互作用的Aharonov-Bohm环中的持续电荷流和自旋流。与传统的方法不同,我们目前的计划规避直接评估的本征值和本征态的系统哈密顿量,以确定持续电流,这基本上减少了可能的数值误差,特别是对于较大的环。详细分析了量子环中持续电荷流和自旋流中Aharonov-Bohm通量和自旋轨道相互作用的相互作用,并给出了在已知自旋轨道场的情况下,估计任一自旋轨道场强度的可能性.所有这些特征即使在杂质存在下也是完全不变的,因此可以通过实验来证实。

英文摘要:

We put forward a new approach based on Green's function formalism to evaluate precisely persistent charge and spin currents in an Aharonov-Bohm ring subjected to Rashba and Dresselhaus spin-orbit interactions. Unlike conventional methods our present scheme circumvents direct evaluation of eigenvalues and eigenstates of the system Hamiltonian to determine persistent currents which essentially reduces possible numerical errors, especially for larger rings. The interplay of Aharonov-Bohm flux and spin-orbit interactions in persistent charge and spin currents of quantum rings is analyzed in detail and our results lead to a possibility of estimating the strength of any one of the spin-orbit fields provided the other one is known. All these features are exactly invariant even in presence of impurities, and therefore, can be substantiated experimentally.

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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