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arXiv 2102.13115cond-mat.str-elcond-mat.mes-hall
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Weyl半金属中的电量子振荡

Electric Quantum Oscillation in Weyl Semimetals

Kyusung Hwang, Woo-Ram Lee, Kwon Park

摘要:

在平行的电场和磁场作用下,两个手性相反的Weyl节点之间的电荷泵产生手性异常,从而导致Weyl半金属中的电子输运是非常特殊的。在这里,我们发展了一个完整的非平衡态量子输运理论的手征异常的基础上,手征电荷泵本质上是什么,但布洛赫振荡。具体地说,通过使用Keldysh非平衡格林函数方法,它表明,有一个丰富的结构中的手征反常输运,包括负磁阻,非欧姆行为,江崎津峰,最后的直流电流的谐振振荡作为电场的函数,称为电量子振荡。我们认为,超出了通常的线性响应行为,在BiSb合金中观察到的非欧姆行为可以被视为发生电量子振荡的前兆,这是拓扑和能量保护外尔半金属。

英文摘要:

Electronic transport in Weyl semimetals is quite extraordinary due to the topological property of the chiral anomaly generating the charge pumping between two distant Weyl nodes with opposite chiralities under parallel electric and magnetic fields. Here, we develop a full nonequilibrium quantum transport theory of the chiral anomaly, based on the fact that the chiral charge pumping is essentially nothing but the Bloch oscillation. Specifically, by using the Keldysh nonequilibrium Green function method, it is shown that there is a rich structure in the chiral anomaly transport, including the negative magnetoresistance, the non-Ohmic behavior, the Esaki-Tsu peak, and finally the resonant oscillation of the DC electric current as a function of electric field, called the electric quantum oscillation. We argue that, going beyond the usual behavior of linear response, the non-Ohmic behavior observed in BiSb alloys can be regarded as a precursor to the occurrence of electric quantum oscillation, which is both topologically and energetically protected in Weyl semimetals.

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