Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2

Yueshan Xu, Jianzhou Zhao, Changjiang Yi, Qi Wang, Qiangwei Yin, Yilin Wang, Xiaolei Hu, Luyang Wang, Enke Liu, Gang Xu, Ling Lu, Alexey A. Soluyanov, Hechang Lei, Youguo Shi, Jianlin Luo and Zhi-Guo Chen ()
Additional contact information
Yueshan Xu: Institute of Physics, Chinese Academy of Sciences
Jianzhou Zhao: Southwest University of Science and Technology
Changjiang Yi: Institute of Physics, Chinese Academy of Sciences
Qi Wang: Renmin University of China
Qiangwei Yin: Renmin University of China
Yilin Wang: Brookhaven National Laboratory
Xiaolei Hu: Institute of Physics, Chinese Academy of Sciences
Luyang Wang: School of Physics, Sun Yat-Sen University
Enke Liu: Institute of Physics, Chinese Academy of Sciences
Gang Xu: Huazhong University of Science and Technology
Ling Lu: Institute of Physics, Chinese Academy of Sciences
Alexey A. Soluyanov: Universität Zürich
Hechang Lei: Renmin University of China
Youguo Shi: Institute of Physics, Chinese Academy of Sciences
Jianlin Luo: Institute of Physics, Chinese Academy of Sciences
Zhi-Guo Chen: Institute of Physics, Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: 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 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.

Date: 2020
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DOI: 10.1038/s41467-020-17234-0

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