Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals
Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals
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相互作用对双外尔半金属手性光电流量子化的影响
DOI：
10.3390/sym12060919
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Ipsita Mandal
中科院分区：
文献类型：
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作者：
Ipsita Mandal
圆形光电流效应（CPGE）是响应于所施加的AC电场而在光学活性材料中产生的光电流，并且其根据入射圆偏振光的手性而改变符号。它是一个非线性的直流电流，因为它是二阶在所施加的电场，并为一定范围的低频，采取了一个量化值成比例的拓扑电荷的系统，这是一个源的非零贝里通量。我们表明，对于一个非相互作用的双Weyl节点，CPGE是成比例的两个量子的Berry通量。在研究短程哈伯德相互作用的影响，一阶修正，我们发现，这种量子化被破坏。这意味着，与带隙相的量子霍尔效应或场论中的手征异常不同，拓扑半金属中CPGE的量子化不受保护。
The circular photogalvanic effect (CPGE) is the photocurrent generated in an optically active material in response to an applied AC electric field, and it changes sign depending on the chirality of the incident circularly polarized light. It is a non-linear DC current as it is second order in the applied electric field, and for a certain range of low frequencies, takes on a quantized value proportional to the topological charge for a system which is a source of non-zero Berry flux. We show that for a non-interacting double-Weyl node, the CPGE is proportional to two quanta of Berry flux. On examining the effect of short-ranged Hubbard interactions up to first-order corrections, we find that this quantization is destroyed. This implies that unlike the quantum Hall effect in gapped phases or the chiral anomaly in field theories, the quantization of the CPGE in topological semimetals is not protected.