Surface coupling in Bi2Se3 ultrathin films by screened Coulomb interaction

Jia-nan Liu, Xu Yang, Haopu Xue, Xue-song Gai, Rui Sun, Yang Li, Zi-Zhao Gong, Na Li, Zong-Kai Xie, Wei He, Xiang-Qun Zhang, Desheng Xue and Zhao-Hua Cheng ()
Additional contact information
Jia-nan Liu: Institute of Physics Chinese Academy of Sciences
Xu Yang: Institute of Physics Chinese Academy of Sciences
Haopu Xue: Institute of Physics Chinese Academy of Sciences
Xue-song Gai: Institute of Physics Chinese Academy of Sciences
Rui Sun: Institute of Physics Chinese Academy of Sciences
Yang Li: Institute of Physics Chinese Academy of Sciences
Zi-Zhao Gong: Institute of Physics Chinese Academy of Sciences
Na Li: Institute of Physics Chinese Academy of Sciences
Zong-Kai Xie: Institute of Physics Chinese Academy of Sciences
Wei He: Institute of Physics Chinese Academy of Sciences
Xiang-Qun Zhang: Institute of Physics Chinese Academy of Sciences
Desheng Xue: Lanzhou University
Zhao-Hua Cheng: Institute of Physics Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract Single-particle band theory has been very successful in describing the band structure of topological insulators. However, with decreasing thickness of topological insulator thin films, single-particle band theory is insufficient to explain their band structures and transport properties due to the existence of top and bottom surface-state coupling. Here, we reconstruct this coupling with an equivalently screened Coulomb interaction in Bi2Se3 ultrathin films. The thickness-dependent position of the Dirac point and the magnitude of the mass gap are discussed in terms of the Hartree approximation and the self-consistent gap equation. We find that for thicknesses below 6 quintuple layers, the magnitude of the mass gap is in good agreement with the experimental results. Our work provides a more accurate means of describing and predicting the behaviour of quasi-particles in ultrathin topological insulator films and stacked topological systems.

Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-023-40035-0 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40035-0

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-023-40035-0

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().