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Realizing a Superconducting Square-Lattice Bismuth Monolayer

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Title
Realizing a Superconducting Square-Lattice Bismuth Monolayer
Author(s)
Eunseok Oh; Kyung-Hwan Jin; Han Woong Yeom
Publication Date
2023-04
Journal
ACS Nano, v.17, no.8, pp.7604 - 7610
Publisher
American Chemical Society
Abstract
Interplay of crystal symmetry, strong spin-orbit coupling (SOC), and many-body interactions in low-dimensional materials provides a fertile ground for the discovery of unconventional electronic and magnetic properties and versatile functionalities. Two-dimensional (2D) allotropes of group 15 elements are appealing due to their structures and controllability over symmetries and topology under strong SOC. Here, we report the heteroepitaxial growth of a proximity-induced superconducting 2D square-lattice bismuth monolayer on superconducting Pb films. The square lattice of monolayer bismuth films in a C4 symmetry together with a stripey moiré structure is clearly resolved by our scanning tunneling microscopy, and its atomic structure is revealed by density functional theory (DFT) calculations. A Rashba-type spin-split Dirac band is predicted by DFT calculations to exist at the Fermi level and becomes superconducting through the proximity effect from the Pb substrate. We suggest the possibility of a topological superconducting state in this system with magnetic dopants/field. This work introduces an intriguing material platform with 2D Dirac bands, strong SOC, topological superconductivity, and the moiré superstructure.
URI
https://pr.ibs.re.kr/handle/8788114/14074
DOI
10.1021/acsnano.2c12884
ISSN
1936-0851
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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