Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge)
| Autor: | Zhen Zhu, Jin Hu, Hao Zheng, S. K. Mo, L. L. Lev, Si Li, Tieying Yang, Q. Wan, C. L. Wu, Weikang Wu, Vladimir N. Strocov, Shengyuan A. Yang, Y. B. Huang, C. Peng, Zhiqiang Mao, Zhongjun Chen, Nan Xu, Jin-Feng Jia, Mou Yang, Y. G. Shi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Valence (chemistry) Photoemission spectroscopy 02 engineering and technology Fermion 021001 nanoscience & nanotechnology Coupling (probability) Topology 01 natural sciences Semimetal symbols.namesake Topological insulator Phase (matter) 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons van der Waals force 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.165107 |
| Popis: | Using spin-resolved and angle-resolved photoemission spectroscopy and first-principles calculations, we have identified bulk band inversion and the spin-polarized surface state evolved from a weak topological insulator (TI) phase in van der Waals materials ${\mathrm{Nb}}_{3}X{\mathrm{Te}}_{6}$ $(X=\mathrm{Si}, \mathrm{Ge})$. The fingerprints of weak TIs homologically emerge with hourglass fermions as multinodal chains composed by the same pair of valence and conduction bands gapped by spin-orbit coupling. The unique topological state, with a pair of valence and conduction bands encoding both weak TI and hourglass semimetal nature, is essential and guaranteed by nonsymmorphic symmetry. It is distinct from TIs studied previously based on band inversions without symmetry protections. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|