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Article

Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals

Faculty of Science and Technology, University of Stavanger, 4036 Stavanger, Norway
Symmetry 2020, 12(6), 919; https://doi.org/10.3390/sym12060919
Received: 5 May 2020 / Revised: 20 May 2020 / Accepted: 22 May 2020 / Published: 2 June 2020
(This article belongs to the Special Issue Symmetries in Quantum Condensed Matter)
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. View Full-Text
Keywords: circular photogalvanic effect; double-Weyl semimetals; quantization circular photogalvanic effect; double-Weyl semimetals; quantization
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MDPI and ACS Style

Mandal, I. Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals. Symmetry 2020, 12, 919. https://doi.org/10.3390/sym12060919

AMA Style

Mandal I. Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals. Symmetry. 2020; 12(6):919. https://doi.org/10.3390/sym12060919

Chicago/Turabian Style

Mandal, Ipsita. 2020. "Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals" Symmetry 12, no. 6: 919. https://doi.org/10.3390/sym12060919

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