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Resonant Charge Current in a rashba ring Induced by Spin-Dependent Potential

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Communications in Theoretical Physics 2008年第12期50卷 1453-1456页

作者： JIANG Zhan-Feng LI Hong Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang 050016 China

A on,dimensional ring subject to rashba spin-orbit coupling is investigated. When it is attached to a lead with spin-dependent chemical potential, there will be charge current in the ring. The charge current response is resonantly maximized when the Fermi energy of the lead is equal to any energy level of the 1D ring. And if two probes are attached to the ring, the electric voltage between them creates sawtooth-like wave, which indicates the direction of the charge current. A ferromagnetic lead can also induce persistent charge current, which can be detected by magnetization intensity measurement.

关键词： resonant current rashba ring spin-dependent potential

Controllable persistent spin-polarized charge current in a rashba ring

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Journal of Semiconductors 2017年第8期38卷 6-10页

作者： Feng Liang Benling Gao Jun Zhang Yu Gu School of Mathematics and Physics Huaiyin Institute of Technology Department of Physic and Siyuan Laboratory Jinan University

We theoretically predict the appearance of a persistent charge current in a rashba ring with a normal and a ferromagnetic lead under no external bias. This charge current is the result of the breaking of the time inversion symmetry in the original persistent pure spin current induced by the rashba spin-orbit coupling （RSOC） in the ring due to the existence of the ferromagnetic lead. With the Keldysh Green＇s function technique, we find that not only the magnitude and sign but also the spin polarization of＇the generated charge current is determined by the system parameters such as the magnetization direction of the ferromagnetic lead, the tunneling coefficient, the strength of the RSOC and the exchange energy of the ferromagnetic lead, which are all tunable in experiments, that is, a controllable persistent spin-polarized charge current can be obtained in such a device.

关键词： spin current rashba spin-orbit coupling rashba ring

Magnetic flux assisted thermospin transport in a rashba ring

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Journal of Semiconductors 2016年第10期37卷 21-24页

作者：梁峰高本领古宇 Department of Physics Huaiyin Institute of Technology Department of Physic and Siyuan Laboratory Jinan University

The electron transport through a rashba ring with a magnetic flux and driven by a temperature difference is investigated. It is found that the spin interference effect induced by the rashba spin-orbit interaction and by the magnetic flux can break the balance between the spin-up and spin-down component currents in the thermally driven charge current and thus result in a spin current. The analytical derivation and numerical calculations reveal that the magnitude, sign, peaks and spin-polarization of the generated spin current can be readily modulated by the system parameters. In particular, with some choices of the parameters, the spin polarization of the generated spin current can reach 100%, that is, a fully spin-polarized thermospin current can be produced. These results may help the use of the spin-dependent Seebeck effect to generate and manipulate a spin current.

关键词： spin current Seebeck effect rashba ring