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.
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)。
作者简介
Shize Cao,These authors contributed equally to this work;Cuiwei Zhang,These authors contributed equally to this work;Yueshan Xu,These authors contributed equally to this work;Corresponding author:Jianzhou Zhao.E-mail:jzzhao@swust.edu.cn;Corresponding author:Yun-Ze Long.E-mail:yunze.long@qdu.edu.cn;Corresponding author:Zhi-Guo Chen.E-mail:zgchen@iphy.ac.cn。
