论文标题
相互作用对双向半金属的手性光电流量化的影响
Effect of interactions on the quantization of the chiral photocurrent for double-Weyl semimetals
论文作者
论文摘要
圆形光藻（CPGE）是响应于施加的AC电场而在光学活性材料中产生的光电流，并且根据入射循环极化光的手性而改变标志。它是一个非线性直流电流，因为它在应用的电场中是二阶，并且对于一定范围的低频，它的量化值与拓扑电荷成比例的系统，这是一个非零浆果通量的来源。我们表明，对于非相互作用的双向节点，CPGE与两个量子的浆果通量成正比。在检查短程哈伯德相互作用的效果直至一阶校正，我们发现该量化被破坏了。这意味着与差距相或田间理论中的手性异常中的量子霍尔效应不同，拓扑半学中CPGE的量化不受保护。
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 nonzero 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 upto 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.
