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2024 Volume 33 Issue 11
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Man Li, Qi Wang, Liqin Zhou(周丽琴), Wenhua Song(宋文华), Huan Ma(马欢), Pengfei Ding(丁鹏飞), Alexander Fedorov, Yaobo Huang(黄耀波), Bernd Büchner, Hechang Lei(雷和畅), Shancai Wang(王善才), and Rui Lou(娄睿). 2024: Visualizing the electronic structure of kagome magnet LuMn6Sn6 by angle-resolved photoemission spectroscopy, Chinese Physics B, 33(11): 117101. doi: 10.1088/1674-1056/ad7afe
Citation: Man Li, Qi Wang, Liqin Zhou(周丽琴), Wenhua Song(宋文华), Huan Ma(马欢), Pengfei Ding(丁鹏飞), Alexander Fedorov, Yaobo Huang(黄耀波), Bernd Büchner, Hechang Lei(雷和畅), Shancai Wang(王善才), and Rui Lou(娄睿). 2024: Visualizing the electronic structure of kagome magnet LuMn6Sn6 by angle-resolved photoemission spectroscopy, Chinese Physics B, 33(11): 117101. doi: 10.1088/1674-1056/ad7afe
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Visualizing the electronic structure of kagome magnet LuMn6Sn6 by angle-resolved photoemission spectroscopy

  • 1 School of Information Network Security, People's Public Security University of China, Beijing 100038, China;

  • 2 Department of Physics, Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), and Beijing Key Laboratory of Opto-electronic Functional Materials & Micronano Devices, Renmin University of China, Beijing 100872, China;

  • 3 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

  • 4 University of Chinese Academy of Sciences, Beijing 100049, China;

  • 5 Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden 01069, Germany;

  • 6 Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, Berlin 12489, Germany;

  • 7 Joint Laboratory "Functional Quantum Materials" at BESSY II, Berlin 12489, Germany;

  • 8 Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;

  • 9 Institute for Solid State and Materials Physics, TU Dresden, Dresden 01062, Germany

  • Received Date: 22/07/2024
    Accepted Date: 02/09/2024
    Available Online: 15/11/2024
  • Fund Project:

    Project supported by the National Natural Science Foundation of China (Grant No. 12204536), the Fundamental Research Funds for the Central Universities, and the Research Funds of People’s Public Security University of China (PPSUC) (Grant No. 2023JKF02ZK09).

  • PACS: 71.20.-b; 79.60.-i

  • Searching for the dispersionless flat band (FB) in quantum materials, especially in topological systems, becomes an interesting topic. The kagome lattice is an ideal platform for such exploration because the FB can be naturally induced by the underlying destructive interference. Nevertheless, the magnetic kagome system that hosts the FB close to the Fermi level ($E_{\rm F}$) is exceptionally rare. Here, we study the electronic structure of a kagome magnet LuMn$_6$Sn$_6$ by combining angle-resolved photoemission spectroscopy and density functional theory calculations. The observed Fermi-surface topology and overall band dispersions are similar to previous studies of the $X$Mn$_6$Sn$_6$ ($X = {\rm Dy}$, Tb, Gd, Y) family of compounds. We clearly observe two kagome-derived FBs extending through the entire Brillouin zone, and one of them is located just below $E_{\rm F}$. The photon-energy-dependent measurements reveal that these FBs are nearly dispersionless along the $k_z$ direction as well, supporting the quasi-two-dimensional character of such FBs. Our results complement the $X$Mn$_6$Sn$_6$ family and demonstrate the robustness of the FB features across this family.

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Visualizing the electronic structure of kagome magnet LuMn6Sn6 by angle-resolved photoemission spectroscopy

  • Received Date: 22/07/2024
  • Accepted Date: 02/09/2024
  • Available Online: 15/11/2024
Fund Project: 

Abstract: 

Searching for the dispersionless flat band (FB) in quantum materials, especially in topological systems, becomes an interesting topic. The kagome lattice is an ideal platform for such exploration because the FB can be naturally induced by the underlying destructive interference. Nevertheless, the magnetic kagome system that hosts the FB close to the Fermi level ($E_{\rm F}$) is exceptionally rare. Here, we study the electronic structure of a kagome magnet LuMn$_6$Sn$_6$ by combining angle-resolved photoemission spectroscopy and density functional theory calculations. The observed Fermi-surface topology and overall band dispersions are similar to previous studies of the $X$Mn$_6$Sn$_6$ ($X = {\rm Dy}$, Tb, Gd, Y) family of compounds. We clearly observe two kagome-derived FBs extending through the entire Brillouin zone, and one of them is located just below $E_{\rm F}$. The photon-energy-dependent measurements reveal that these FBs are nearly dispersionless along the $k_z$ direction as well, supporting the quasi-two-dimensional character of such FBs. Our results complement the $X$Mn$_6$Sn$_6$ family and demonstrate the robustness of the FB features across this family.

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