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

doi:10.1088/1674-1056/ad7afe

中国物理B ›› 2024, Vol. 33 ›› Issue (11): 117101-117101.doi: 10.1088/1674-1056/ad7afe

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

Man Li(李满)^1,†, Qi Wang(王琦)², Liqin Zhou(周丽琴)^3,4, Wenhua Song(宋文华)², Huan Ma(马欢)², Pengfei Ding(丁鹏飞)², Alexander Fedorov^5,6,7, Yaobo Huang(黄耀波)⁸, Bernd Büchner^5,9, Hechang Lei(雷和畅)^2,‡, Shancai Wang(王善才)^2,§, and Rui Lou(娄睿)^5,6,7,¶

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-Stra?e 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

收稿日期:2024-07-22 修回日期:2024-09-02 接受日期:2024-09-14 出版日期:2024-11-15 发布日期:2024-11-15
基金资助:
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).

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-Stra?e 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:2024-07-22 Revised:2024-09-02 Accepted:2024-09-14 Online:2024-11-15 Published:2024-11-15
Contact: Man Li, Hechang Lei, Shancai Wang, Rui Lou E-mail:lmrucphys@ruc.edu.cn;hlei@ruc.edu.cn;scw@ruc.edu.cn;lourui09@gmail.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: flat band, kagome magnet, angle-resolved photoemission spectroscopy

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.

Key words: flat band, kagome magnet, angle-resolved photoemission spectroscopy

中图分类号: (Electron density of states and band structure of crystalline solids)

71.20.-b

79.60.-i (Photoemission and photoelectron spectra)

Man Li(李满), Qi Wang(王琦), 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). Visualizing the electronic structure of kagome magnet LuMn₆Sn₆ by angle-resolved photoemission spectroscopy[J]. 中国物理B, 2024, 33(11): 117101-117101.

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

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

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