期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17234-0
关键词
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资金
- National Key Research and Development Program of China [2017YFA0304700, 2016YFA0300600, 2017YFA0302901, 2016YFA0300504, 2017YFA0303800, 2016YFA0302400, 2018YFA0307000]
- Chinese Academy of Sciences [XDB33000000]
- Pioneer Hundred Talents Program of the Chinese Academy of Sciences
- National Natural Science Foundation of China [11604273, 11774399, 11574394, 11774423, 11822412, 11721404, 11874022]
- Longshan Academic Talent Research Supporting Program of SWUST [17LZX527]
- Beijing Natural Science Foundation [Z180008]
- SNSF NCCR MARVEL grant
- SNSF NCCR QSIT grant
- Microsoft Research
- SNSF Professorship
- Pauli Center
- U.S. Department of Energy, Office of Science, Basic Energy Sciences as a part of the Computational Materials Science Program through the Center for Computational Design of Functional Strongly Correlated Materials and Theoretical Spectroscopy
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 similar to 4eV) 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 similar to 4eV, 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. How electron correlation interplays with topological states remains rarely explored. Here, the authors report flat band arising due to electron correlations in magnetic Weyl semimetal Co3Sn2S2 from a combined optical-spectroscopy and simulation study.
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