Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals
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 ap...
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MDPI AG
2020-06-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/12/6/919 |
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| author | Ipsita Mandal |
| author_facet | Ipsita Mandal |
| author_sort | Ipsita Mandal |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T19:25:56Z |
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| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T19:25:56Z |
| publishDate | 2020-06-01 |
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| spelling | doaj.art-758269bfc1424ce9aa9f9ef3214c3da72023-11-20T02:33:27ZengMDPI AGSymmetry2073-89942020-06-0112691910.3390/sym12060919Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl SemimetalsIpsita Mandal0Faculty of Science and Technology, University of Stavanger, 4036 Stavanger, NorwayThe 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.https://www.mdpi.com/2073-8994/12/6/919circular photogalvanic effectdouble-Weyl semimetalsquantization |
| spellingShingle | Ipsita Mandal Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals Symmetry circular photogalvanic effect double-Weyl semimetals quantization |
| title | Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals |
| title_full | Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals |
| title_fullStr | Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals |
| title_full_unstemmed | Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals |
| title_short | Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals |
| title_sort | effect of interactions on the quantization of the chiral photocurrent for double weyl semimetals |
| topic | circular photogalvanic effect double-Weyl semimetals quantization |
| url | https://www.mdpi.com/2073-8994/12/6/919 |
| work_keys_str_mv | AT ipsitamandal effectofinteractionsonthequantizationofthechiralphotocurrentfordoubleweylsemimetals |