Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points
Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points
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DOI：
10.1103/physrevlett.124.196603
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发表时间：
2020-05-15
影响因子：
8.6
通讯作者：
Moore, Joel E.
中科院分区：
文献类型：
--
作者：
Avdoshkin, Alexander;Kozii, Vladyslav;Moore, Joel E.
手征光电流或圆光电流效应（CPGE）是一种依赖于圆极化方向的光电流。在无无序、无相互作用的手征外尔半金属中，由于能带拓扑的原因，效应的大小近似量子化为与材料无关的量子e（3）/h（2）。我们研究了一阶修正由于库仑和Hubbatrd相互作用的连续模型中的Weyl半金属，其中已知的其他带的修正是缺席。我们发现，包含的相互作用一般打破了量化。的修正是类似的，但更大的幅度比以前研究的相互作用校正（非拓扑）的线性光学电导率的石墨烯，并具有潜在的可观察到的频率依赖性。我们的结论是，不像量子霍尔效应在带隙相或场理论中的手征异常，量子化的CPGE在Weyl半金属不受保护，但相互作用强度的微扰修正。
The chiral photocurrcnt or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, noninteracting chiral Weyl semimetal, the magnitude of the effect is approximately quantized with a material-independent quantum e(3)/h(2) for reasons of band topology. We study the first-order corrections due to the Coulomb and Hubbatrd interactions in a continuum model of a Weyl semimetal in which known corrections from other bands are absent. We find that the inclusion of interactions generically breaks the quantization. The corrections are similar but larger in magnitude than previously studied interaction corrections to the (nontopological) linear optical conductivity of graphene, and have a potentially observable frequency dependence. We conclude that, unlike the quantum Hall effect in gapped phases or the chiral anomaly in field theories, the quantization of the CPGE in Weyl semimetals is not protected but has perturbative corrections in interaction strength.