Optical Signature of Flat Bands in Topological Hourglass Semimetal Nb3SiTe6
Shize Cao, Cuiwei Zhang, Yueshan Xu, Jianzhou Zhao, Youguo Shi, Yun-Ze, Long, Jianlin Luo, Zhi-Guo Chen
TL;DR
This study reveals optical signatures of flat bands in the topological hourglass semimetal Nb3SiTe6, highlighting potential for exploring novel quantum phenomena through optical spectroscopy.
Contribution
First optical spectroscopy investigation of Nb3SiTe6 revealing flat band signatures linked to topological hourglass semimetal properties.
Findings
Observation of a peak at 1.20 eV in optical conductivity spectra.
Identification of direct optical transitions between flat bands.
Insight into flat band contributions to topological quantum phenomena.
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 Nb3SiTe6 with the electric field of the incident light parallel to its crystalline ab-plane. The ab-plane optical conductivity spectra of Nb3SiTe6 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.
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