Optical signature of flat bands in topological hourglass semimetal Nb3SiTe6

doi:10.1088/1674-1056/ad9e9c

中国物理B ›› 2025, Vol. 34 ›› Issue (2): 27101-027101.doi: 10.1088/1674-1056/ad9e9c

Optical signature of flat bands in topological hourglass semimetal Nb₃SiTe₆

Shize Cao(曹仕泽)^1,2,†, Cuiwei Zhang(张翠伟)^2,†, Yueshan Xu(徐越山)^2,†, Jianzhou Zhao(赵建洲)^3,‡, Youguo Shi(石友国)^2,4, Yun-Ze Long(龙云泽)^1,§, Jianlin Luo(雒建林)^2,4, and Zhi-Guo Chen(谌志国)^2,4,¶

1 Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Co-Innovation Center for New Energetic Materials, Southwest University of Science and Technology, Mianyang 621010, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2024-11-03 修回日期:2024-12-12 接受日期:2024-12-13 出版日期:2025-02-15 发布日期:2025-01-15
通讯作者: Jianzhou Zhao, Yun-Ze Long, Zhi-Guo Chen E-mail:jzzhao@swust.edu.cn;yunze.long@qdu.edu.cn;zgchen@iphy.ac.cn
基金资助:
Project supported by the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2021B1515130007), the National Natural Science Foundation of China (Grant Nos. U21A20432 and 52273077), the National Key Research and Development Program of China (Grant No. 2022YFA1403800), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), and the Synergetic Extreme Condition User Facility (SECUF, https://cstr.cn/31123.02.SECUF)- Infrared Unit in THz and Infrared Experimental Station.

Optical signature of flat bands in topological hourglass semimetal Nb₃SiTe₆

1 Collaborative Innovation Center for Nanomaterials & Devices, College of Physics, Qingdao University, Qingdao 266071, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Co-Innovation Center for New Energetic Materials, Southwest University of Science and Technology, Mianyang 621010, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2024-11-03 Revised:2024-12-12 Accepted:2024-12-13 Online:2025-02-15 Published:2025-01-15
Contact: Jianzhou Zhao, Yun-Ze Long, Zhi-Guo Chen E-mail:jzzhao@swust.edu.cn;yunze.long@qdu.edu.cn;zgchen@iphy.ac.cn
Supported by:
Project supported by the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2021B1515130007), the National Natural Science Foundation of China (Grant Nos. U21A20432 and 52273077), the National Key Research and Development Program of China (Grant No. 2022YFA1403800), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), and the Synergetic Extreme Condition User Facility (SECUF, https://cstr.cn/31123.02.SECUF)- Infrared Unit in THz and Infrared Experimental Station.

1. 2025-027101-SI.pdf(1128KB)

摘要/Abstract

摘要： Flat electronic bands in condensed matter provide a rich avenue for exploring novel quantum phenomena. Here, we report an optical spectroscopy study of a topological hourglass semimetal Nb$_{3}$SiTe$_{6}$ with the electric field of the incident light parallel to its crystalline $ab$-plane. The $ab$-plane optical conductivity spectra of Nb$_{3}$SiTe$_{6}$ single crystals exhibit a remarkable peak-like feature around 1.20 eV, which is mainly contributed by the direct optical transitions between the two ab-initio-calculation-derived flat bands along the momentum direction $Z$-$U$. Our results pave the way for investigating exotic quantum phenomena based on the flat bands in topological hourglass semimetals.

关键词: flat band, topological semimetal, optical spectroscopy

Abstract: Flat electronic bands in condensed matter provide a rich avenue for exploring novel quantum phenomena. Here, we report an optical spectroscopy study of a topological hourglass semimetal Nb$_{3}$SiTe$_{6}$ with the electric field of the incident light parallel to its crystalline $ab$-plane. The $ab$-plane optical conductivity spectra of Nb$_{3}$SiTe$_{6}$ single crystals exhibit a remarkable peak-like feature around 1.20 eV, which is mainly contributed by the direct optical transitions between the two ab-initio-calculation-derived flat bands along the momentum direction $Z$-$U$. Our results pave the way for investigating exotic quantum phenomena based on the flat bands in topological hourglass semimetals.

Key words: flat band, topological semimetal, optical spectroscopy

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

71.20.-b

73.21.-b (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems) 78.30.-j (Infrared and Raman spectra) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Shize Cao(曹仕泽), Cuiwei Zhang(张翠伟), Yueshan Xu(徐越山), Jianzhou Zhao(赵建洲), Youguo Shi(石友国), Yun-Ze Long(龙云泽), Jianlin Luo(雒建林), and Zhi-Guo Chen(谌志国). Optical signature of flat bands in topological hourglass semimetal Nb₃SiTe₆[J]. 中国物理B, 2025, 34(2): 27101-027101.

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Optical signature of flat bands in topological hourglass semimetal Nb₃SiTe₆

Optical signature of flat bands in topological hourglass semimetal Nb₃SiTe₆

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