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Valley supercurrent in the Kekule graphene superlattice heterojunction

机译：谷谷超级电流在瓜扣石墨烯超晶格异质结

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摘要

We study the possible valley supercurrent flowing in a valley Josephson junction based on the O-shaped Kekule graphene superlattice (GS), in which the valley coupling term can make the valley degree of freedom condensate and open an energy gap around the Dirac point. It is found that the GS/G/GS formally resembles a conventional Josephson junction and a nonzero valley supercurrent flows through the junction when the arguments of the complex valley coupling terms in each GS are different. Unlike the conventional Josephson current, a local static potential in the middle G region via gate voltage can manipulate the valley supercurrent direction to form the 0-π state transition and, moreover, the valley supercurrent magnitude as well as the current-phase relation can also be modulated by shifting the universal chemical potential of the system. Our findings provide a way to producing the pure valley current in the graphene system.
机译：我们研究基于O形尾骨石墨烯超晶格（GS）在谷Josephson结中流动的可能的谷超电流，其中谷耦合术语可以使得自由度冷凝的谷程度并打开沿狄拉科点的能隙。发现GS / G / GS正式类似于传统的JosephseN结，并且当每个GS中的复谷耦合术语的参数不同时，非零谷超速流过结。与传统的Josephson电流不同，通过栅极电压的局部G区域中的局部静电电位可以操纵谷超电流方向以形成0-π状态转换，而且，此外，谷超电流幅度以及当前相位关系也可以通过移动系统的通用化学潜力来调制。我们的调查结果提供了生产石墨烯系统中纯谷电流的方法。

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  • 来源
    《Physical review》 |2020年第24期|245428.1-245428.8|共8页
  • 作者

    Juan Juan Wang; S. Liu; J. Wang; Jun-Feng Liu;

  • 作者单位

    Department of Physics Southeast University Nanjing 210096 China;

    Department of Physics Southeast University Nanjing 210096 China;

    Department of Physics Southeast University Nanjing 210096 China;

    Department of Physics School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China;

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