Polarity-dependent charge-density wave in a kagome superconductor CsV3Sb5
| Autor: | Kato, Takemi, Li, Yongkai, Nakayama, Kosuke, Wang, Zhiwei, Souma, Seigo, Kitamura, Miho, Horiba, Koji, Kumigashira, Hiroshi, Takahashi, Takashi, Sato, Takafumi |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 106, L121112 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.106.L121112 |
| Popis: | Polar surface and interface play a pivotal role for realizing exotic properties of materials, and a search for such polar states is of crucial importance for expanding materials' functionality. Here we report micro-focused angle-resolved photoemission spectroscopy of CsV3Sb5, a member of recently discovered kagome superconductors AV3Sb5 (A = K, Rb, Cs), and show evidence for the polar nature of cleaved surface which is characterized by Cs- and Sb-terminated surfaces with markedly different fermiology. The Cs-terminated surface shows intriguing doubling of V-derived bands at low temperature associated with the band folding due to the three-dimensional charge-density wave (CDW), whereas the Sb-terminated one shows no band doubling or resultant CDW-gap opening indicative of the suppression of bulk-originated CDW due to polar charge. Such polar-surface-dependent band structure must be incorporated for understanding the origin of unconventional superconducting and charge order at the surface of AV3Sb5. Comment: 10 pages, 13 figures |
| Databáze: | arXiv |
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