Emergent Electromagnetic Induction and Adiabatic Charge Pumping in Noncentrosymmetric Weyl Semimetals
Emergent Electromagnetic Induction and Adiabatic Charge Pumping in Noncentrosymmetric Weyl Semimetals
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DOI：
10.1103/physrevlett.117.216601
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发表时间：
2016-11-18
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Ishizuka, Hiroaki;Hayata, Tomoya;Nagaosa, Naoto
研究了非中心对称Weyl半金属中绝热量子相的光伏效应。我们特别关注的情况下，其中施加一个外部的交流电场。通过考虑广义外尔哈密顿量的非线性项，我们表明，光电流是由圆，而不是线偏振光引起的。这种光生伏打电流可以理解为动量空间中的电磁感应;外尔节点是动量空间中的磁链，其圆周运动感应出电场。这一结果与传统的光伏效应不同，估计的光电流类似于10（-1）-10（1）nA，可以通过实验检测到。
The photovoltaic effect due to the adiabatic quantum phase in noncentrosymmetric Weyl semimetals is studied. We particularly focus on the case in which an external ac electric field is applied. By considering a generalized Weyl Hamiltonian with nonlinear terms, we show that the photocurrent is induced by circularly, rather than linearly, polarized light. This photovoltaic current can be understood as an emergent electromagnetic induction in momentum space; the Weyl node is a magnetic monopole in momentum space, the circular motion of which induces the electric field. This result is distinct from conventional photovoltaic effects, and the estimated photocurrent is similar to 10(-1)-10(1) nA, which can be detected experimentally.