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Title: Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet

Abstract

Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity 1–15, but materials that manifest this feature are rare. In this paper, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co3Sn2S2 (refs. 16–20). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co3Sn2S2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [1];  [1];  [1];  [1];  [1];  [8];  [7]; ORCiD logo [3];  [6]; ORCiD logo [2]; ORCiD logo [9]
+ Show Author Affiliations
  1. Princeton Univ., NJ (United States). Dept. of Physics
  2. Renmin Univ. of China, Beijing (China). Dept. of Physics
  3. Univ. of Zurich (Switzerland). Dept. of Physics
  4. Princeton Univ., NJ (United States). Dept. of Physics; Paul Scherrer Inst., Villigen (Switzerland). Lab. for Muon Spin Spectroscopy
  5. Princeton Univ., NJ (United States). Princeton Center for Theoretical Science
  6. Univ. of Chinese Academy of Sciencese, Beijing (China). CAS Center for Excellence in Topological Quantum Computation
  7. Boston College, Chestnut Hill, MA (United States). Dept. of Physics
  8. Academia Sinica, Taipei (Taiwan). Inst. of Physics
  9. Princeton Univ., NJ (United States). Dept. of Physics and Princeton Inst for the Science and Technology of Materials; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; Ministry of Science and Technology of China; National Natural Science Foundation of China (NSFC); European Research Council (ERC); Chinese Academy of Sciences; National Key Research and Development Program of China
OSTI Identifier:
1638194
Grant/Contract Number:  
AC02-05CH11231; FG-02-05ER46200; FG02-99ER45747; GBMF4547; 2016YFA0300504; 11574394; 11774423; 11822412; 15XNLF06; 15XNLQ07; 18XNLG14; ERC-StGNeupert-757867-PARATOP; 11790313; 11774007; XDPB08-1; 2016YFA0300403; 2018YFA035601
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 5; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Yin, Jia-Xin, Zhang, Songtian S., Chang, Guoqing, Wang, Qi, Tsirkin, Stepan S., Guguchia, Zurab, Lian, Biao, Zhou, Huibin, Jiang, Kun, Belopolski, Ilya, Shumiya, Nana, Multer, Daniel, Litskevich, Maksim, Cochran, Tyler A., Lin, Hsin, Wang, Ziqiang, Neupert, Titus, Jia, Shuang, Lei, Hechang, and Hasan, M. Zahid. Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet. United States: N. p., 2019. Web. doi:10.1038/s41567-019-0426-7.
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Yin, Jia-Xin, Zhang, Songtian S., Chang, Guoqing, Wang, Qi, Tsirkin, Stepan S., Guguchia, Zurab, Lian, Biao, Zhou, Huibin, Jiang, Kun, Belopolski, Ilya, Shumiya, Nana, Multer, Daniel, Litskevich, Maksim, Cochran, Tyler A., Lin, Hsin, Wang, Ziqiang, Neupert, Titus, Jia, Shuang, Lei, Hechang, & Hasan, M. Zahid. Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet. United States. https://doi.org/10.1038/s41567-019-0426-7
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Yin, Jia-Xin, Zhang, Songtian S., Chang, Guoqing, Wang, Qi, Tsirkin, Stepan S., Guguchia, Zurab, Lian, Biao, Zhou, Huibin, Jiang, Kun, Belopolski, Ilya, Shumiya, Nana, Multer, Daniel, Litskevich, Maksim, Cochran, Tyler A., Lin, Hsin, Wang, Ziqiang, Neupert, Titus, Jia, Shuang, Lei, Hechang, and Hasan, M. Zahid. Mon . "Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet". United States. https://doi.org/10.1038/s41567-019-0426-7. https://www.osti.gov/servlets/purl/1638194.
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@article{osti_1638194,
title = {Negative flat band magnetism in a spin–orbit-coupled correlated kagome magnet},
author = {Yin, Jia-Xin and Zhang, Songtian S. and Chang, Guoqing and Wang, Qi and Tsirkin, Stepan S. and Guguchia, Zurab and Lian, Biao and Zhou, Huibin and Jiang, Kun and Belopolski, Ilya and Shumiya, Nana and Multer, Daniel and Litskevich, Maksim and Cochran, Tyler A. and Lin, Hsin and Wang, Ziqiang and Neupert, Titus and Jia, Shuang and Lei, Hechang and Hasan, M. Zahid},
abstractNote = {Electronic systems with flat bands are predicted to be a fertile ground for hosting emergent phenomena including unconventional magnetism and superconductivity 1–15, but materials that manifest this feature are rare. In this paper, we use scanning tunnelling microscopy to elucidate the atomically resolved electronic states and their magnetic response in the kagome magnet Co3Sn2S2 (refs. 16–20). We observe a pronounced peak at the Fermi level, which we identify as arising from the kinetically frustrated kagome flat band. On increasing the magnetic field up to ±8 T, this state exhibits an anomalous magnetization-polarized many-body Zeeman shift, dominated by an orbital moment that is opposite to the field direction. Such negative magnetism is induced by spin–orbit-coupling quantum phase effects21–25 tied to non-trivial flat band systems. We image the flat band peak, resolve the associated negative magnetism and provide its connection to the Berry curvature field, showing that Co3Sn2S2 is a rare example of a kagome magnet where the low-energy physics can be dominated by the spin–orbit-coupled flat band.},
doi = {10.1038/s41567-019-0426-7},
journal = {Nature Physics},
number = 5,
volume = 15,
place = {United States},
year = {Mon Feb 18 00:00:00 EST 2019},
month = {Mon Feb 18 00:00:00 EST 2019}
}
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https://doi.org/10.1038/s41567-019-0426-7
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    Works referencing / citing this record:

    Chiral phonons in kagome lattices
    journal, September 2019

    Tunable Flat Band in Large‐Scale Kagome Lattice of Single Layer (BETS) 2 GaCl 4
    journal, October 2019

    Dirac fermions and flat bands in the ideal kagome metal FeSn
    journal, December 2019

    On the anisotropies of magnetization and electronic transport of magnetic Weyl semimetal Co 3 Sn 2 S 2
    journal, November 2019

    • Shen, Jianlei; Zeng, Qingqi; Zhang, Shen
    • Applied Physics Letters, Vol. 115, Issue 21
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    Exchange biased anomalous Hall effect driven by frustration in a magnetic kagome lattice
    journal, January 2020

    Molecular beam epitaxy growth of antiferromagnetic Kagome metal FeSn
    journal, August 2019

    • Inoue, Hisashi; Han, Minyong; Ye, Linda
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    • DOI: 10.1063/1.5111792

    Vector field controlled vortex lattice symmetry in LiFeAs using scanning tunneling microscopy
    journal, April 2019

    Intrinsic Anomalous Nernst Effect Amplified by Disorder in a Half-Metallic Semimetal
    journal, December 2019

    Tunable anomalous Hall conductivity through volume-wise magnetic competition in a topological kagome magnet
    journal, January 2020

    Dirac fermions and flat bands in the ideal kagome metal FeSn
    text, January 2019

    Intrinsic anomalous Nernst effect amplified by disorder in a half-metallic semimetal
    text, January 2019

    Exchange biased Anomalous Hall Effect driven by frustration in a magnetic Kagome lattice
    text, January 2019

    Exchange biased anomalous Hall effect driven by frustration in a magnetic kagome lattice
    journal, January 2020

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