Optical signature of flat bands in topological hourglass semimetal Nb_(3)SiTe_(6)  

作　　者：Shize Cao Cuiwei Zhang Yueshan Xu Jianzhou Zhao Youguo Shi Yun-Ze Long Jianlin Luo Zhi-Guo Chen 曹仕泽;张翠伟;徐越山;赵建洲;石友国;龙云泽;雒建林;谌志国

机构地区：[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

出　　处：《Chinese Physics B》2025年第2期388-392,共5页中国物理B(英文版)

基　　金：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)。

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 

分 类 号：O57[理学—粒子物理与原子核物理]