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Valley current in graphene through electron-phonon interaction

机译：石墨烯中的谷电流通过电子 - 声子相互作用

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摘要

We discuss valley current, which is carried by quasiparticles in graphene. We show that the valley current arises owing to a peculiar term in the electron-phonon collision integral that mixes the scalar and vector gauge-field-like vertices in the electron-phonon interaction. This mixing makes collisions of phonons with electrons sensitive to their chirality, which is opposite in two valleys. As a result of collisions with phonons, electrons of the different valleys deviate in opposite directions. The valley-dependent deviation of the quasiparticle current does not request for breaking the spatial inversion symmetry. The effect exists both in pristine graphene or bilayer graphene samples, and it increases with temperature owing to a higher rate of collisions with phonons at higher temperatures. The valley current carried by quasiparticles could be detected by measuring the electric current using a nonlocal transformer of a suitable design.
机译：我们讨论谷电流，该电流由石墨烯中的Quasiply携带。我们表明谷电流由于电子 - 声子碰撞积分中的特殊项而产生，它们在电子 - 声子相互作用中混合标量和向量仪器场 - 场类似顶点。这种混合使子子的碰撞与他们的手性敏感的电子，这在两个山谷中相对。由于与声子碰撞，不同谷的电子偏向相反的方向。 Quasiparticle电流的谷依赖性偏差不请求破坏空间反转对称性。在原始石墨烯或双层石墨烯样品中既存在效果，而且由于在较高温度下与声子的碰撞速度较高，它随温度增加。可以通过使用合适设计的非局部变压器测量电流来检测由Quasiply携带的谷电流。

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  • 来源
    《Physical review》 |2020年第24期|241401.1-241401.5|共5页
  • 作者

    Ankang Liu; Alexander M. Finkelstein;

  • 作者单位

    Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA and Department of Condensed Matter Physics The Weizmann Institute of Science Rehovot 76100 Israel;

    Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA and Department of Condensed Matter Physics The Weizmann Institute of Science Rehovot 76100 Israel;

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