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arXiv 2003.10117cond-mat.mes-hall
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电子碰撞引起的非定域响应的符号反转

Sign reversal of nonlocal response due to electron collisions

K. E. Nagaev

摘要:

已知电子-电子碰撞在存在电流的情况下引起非局部电压降。半唯象理论预测,这种下降是相反的方向,目前在弹道制度。我们使用一个微观的方法,并表明,这种下降的迹象可能是两个迹象取决于温度和源和探针接触之间的距离。符号的变化对应于主导散射过程从正面碰撞到电子后向散射的变化。我们的结果与实验数据一致。

英文摘要:

Electron-electron collisions are known to cause a nonlocal voltage drop in a presence of current flow. The semi-phenomenological theory predicts this drop to be opposite to the direction of the current in the ballistic regime. We use a microscopic approach and show that the sign of this drop may be of both signs depending on the temperature and the distance between the source and probe contacts. The change of sign corresponds to the change of the dominant scattering process from head-on collisions to backward scattering of electrons. Our results agree with the experimental data.

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