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Title: Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co 3Sn 2S 2

Abstract

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 Co 3Sn 2S 2. 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 Co 3Sn 2S 2. 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 Co 3Sn 2Smore » 2. Our work paves the way for exploring flat-band-generated quantum phenomena in WSMs.« less

Authors:
 [1]; ORCiD logo [2];  [1];  [3];  [3];  [4];  [1];  [5]; ORCiD logo [1];  [6]; ORCiD logo [7];  [8]; ORCiD logo [3];  [9];  [1]; ORCiD logo [9]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of Zurich (Switzerland); Southwest Univ. of Science and Technology (China)
  3. Renmin Univ. of China, Beijing (China)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Sun Yat-Sen Univ., Guangzhou (China)
  6. Huazhong Univ. of Science and Technology, Wuhan (China)
  7. Songshan Lake Materials Lab., Guangdong (China); Chinese Academy of Sciences (CAS), Beijing (China)
  8. Univ. of Zurich (Switzerland)
  9. Chinese Academy of Sciences (CAS), Beijing (China); Songshan Lake Materials Lab. (China)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1659691
Report Number(s):
BNL-216353-2020-JAAM
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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, and Chen, Zhi-Guo. Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2. United States: N. p., 2020. Web. doi:10.1038/s41467-020-17234-0.
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. Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2. United States. doi:10.1038/s41467-020-17234-0.
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, and Chen, Zhi-Guo. Mon . "Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2". United States. doi:10.1038/s41467-020-17234-0. https://www.osti.gov/servlets/purl/1659691.
@article{osti_1659691,
title = {Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2},
author = {Xu, Yueshan and Zhao, Jianzhou and Yi, Changjiang and Wang, Qi and Yin, Qiangwei and Wang, Yilin and Hu, Xiaolei and Wang, Luyang and Liu, Enke and Xu, Gang and Lu, Ling and Soluyanov, Alexey A. and Lei, Hechang and Shi, Youguo and Luo, Jianlin and Chen, Zhi-Guo},
abstractNote = {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.},
doi = {10.1038/s41467-020-17234-0},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {8}
}

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