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arXiv 1206.6503cond-mat.mes-hall
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非均匀Rashba自旋轨道耦合石墨烯pn结

Graphene p-n junctions with nonuniform Rashba spin-orbit coupling

Marek Rataj, Józef Barnaś

摘要:

从理论上研究了具有Rashba自旋轨道耦合的石墨烯基pn结的线性电导。一个平方势阶用来模拟结,而耦合是根据凯恩-梅勒模型(C.L. Kane和E.J. Mele,Phys.Rev.Lett. 95,226801(2005))。主要目的是描述的电子输运的路口Rashba参数是不均匀的。当石墨烯被原子层不对称地覆盖时,或者当Rashba耦合强烈依赖于电场时,可以出现这种不均匀性。结果表明,电导显着修改所考虑的不均匀性,这是最清楚地表现为在一定的电位阶跃高度的异常最小值。

英文摘要:

Linear conductance of graphene-based p-n junctions with Rashba spin-orbit coupling is considered theoretically. A square potential step is used to model the junctions, while the coupling is introduced in terms of the Kane-Mele model (C.L. Kane and E.J. Mele, Phys.Rev.Lett. 95, 226801(2005)). The main objective is a description of electronic transport in junctions where Rashba parameter is nonuniform. Such a nonuniformity can appear when graphene is asymmetrically covered with atomic layers, or when Rashba coupling is strongly dependent on electric field. It is shown that conductance is significantly modified by the considered nonuniformity, which is most clearly manifested by an anomalous minimum at a certain potential step height.

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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