Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2

Xu, Yueshan; Zhao, Jianzhou; Yi, Changjiang; Wang, Qi; Yin, Qiangwei; Wang, Yilin; Hu, Xiaolei; Wang, Luyang; Liu, Enke; Xu, Gang; Lu, Ling; Soluyanov, Alexey A.; Lei, Hechang; Shi, Youguo; Luo, Jianlin; Chen, Zhi-Guo

doi:10.1038/s41467-020-17234-0

Title: Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co₃Sn₂S₂

Journal Article · Mon Aug 10 00:00:00 EDT 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-17234-0· OSTI ID:1659691

Xu, Yueshan ^[1];

^[2]; Yi, Changjiang ^[1]; Wang, Qi ^[3]; Yin, Qiangwei ^[3]; Wang, Yilin ^[4]; Hu, Xiaolei ^[1]; Wang, Luyang ^[5];

^[1]; Xu, Gang ^[6];

^[7]; Soluyanov, Alexey A. ^[8];

^[3]; Shi, Youguo ^[9]; Luo, Jianlin ^[1];

^[9]

Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Zurich (Switzerland); Southwest Univ. of Science and Technology (China)
Renmin Univ. of China, Beijing (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sun Yat-Sen Univ., Guangzhou (China)
Huazhong Univ. of Science and Technology, Wuhan (China)
Songshan Lake Materials Lab., Guangdong (China); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Zurich (Switzerland)
Chinese Academy of Sciences (CAS), Beijing (China); Songshan Lake Materials Lab. (China)

The interplay between electronic correlations and topological protection may offer a rich avenue for discovering emergent quantum phenomena in condensed matter. However, electronic correlations have so far been little investigated in Weyl semimetals (WSMs) by experiments. Here, we report a combined optical spectroscopy and theoretical calculation study on the strength and effect of electronic correlations in a magnet Co₃Sn₂S₂. The electronic kinetic energy estimated from our optical data is about half of that obtained from single-particle ab initio calculations in the ferromagnetic ground state, which indicates intermediate-strength electronic correlations in this system. Furthermore, comparing the energy and side-slope ratios between the interband-transition peaks at high energies in the experimental and single-particle-calculation-derived optical conductivity spectra with the bandwidth-renormalization factors obtained by many-body calculations enables us to estimate the Coulomb-interaction strength (U ~ 4 eV) in Co₃Sn₂S₂. Besides, a sharp experimental optical conductivity peak at low energy, which is absent in the single-particle-calculation-derived spectrum but is consistent with the optical conductivity peaks obtained by many-body calculations with U ~ 4 eV, indicates that an electronic band connecting the two Weyl cones is flattened by electronic correlations and emerges near the Fermi energy in Co₃Sn₂S₂. Our work paves the way for exploring flat-band-generated quantum phenomena in WSMs.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1659691

Report Number(s):: BNL-216353-2020-JAAM; TRN: US2203467

Journal Information:: Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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