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説明:

Moiré superlattices consisting of two-dimensional materials have attracted immense attention because of emergent phenomena such as flat band-induced Mott insulating states and unconventional superconductivity. However, the effects of spin-orbit coupling on these materials have not yet been fully explored. Here, we show that single- and double-bilayer antimony honeycomb lattices, referred to as antimonene, form moiré superlattices on a Bi(111) substrate due to lattice mismatch. Scanning tunnelling microscopy (STM) measurements reveal the presence of spectral peaks near the Fermi level, which are spatially modulated with the moiré period. Angle-resolved photoemission spectroscopy (ARPES) combined with density functional theory calculations clarify the surface band structure with saddle points near the Fermi level, which allows us to attribute the observed STM spectral peaks to the van Hove singularity. Moreover, spin-resolved ARPES measurements reveal that the observed surface states are Rashba-type spin-polarized. The present work has significant implications in that Fermi surface instability and symmetry breaking may emerge at low temperatures, where the spin degree of freedom and electron correlation also play important roles.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: moiré superlattice, antimonene, Bi(111) surface, van Hove singularity, spin-orbit coupling, atomic layer, Rashba-type spin polarization

刊行年月日: 2024-08-26

出版者: Springer Nature

掲載誌:

• Communications Materials (ISSN: 26624443) vol. 5 p. 1-9 167

研究助成金:

• JSPS 20H05621
• JSPS 22H01961
• JSPS 20K15133
• JSPS 22H01183
• JSPS 23H03818
• JSPS 23H04524
• MEXT (The World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics)
• ATLA JPJ004596 (The Innovative Science and Technology Initiative for Security)

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s43246-024-00615-z

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更新時刻: 2024-08-29 08:30:22 +0900

MDRでの公開時刻: 2024-08-29 08:30:22 +0900