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Realization of a two-dimensional Weyl semimetal and topological Fermi strings.

Authors :
Lu, Qiangsheng
Reddy, P. V. Sreenivasa
Jeon, Hoyeon
Mazza, Alessandro R.
Brahlek, Matthew
Wu, Weikang
Yang, Shengyuan A.
Cook, Jacob
Conner, Clayton
Zhang, Xiaoqian
Chakraborty, Amarnath
Yao, Yueh-Ting
Tien, Hung-Ju
Tseng, Chun-Han
Yang, Po-Yuan
Lien, Shang-Wei
Lin, Hsin
Chiang, Tai-Chang
Vignale, Giovanni
Li, An-Ping
Source :
Nature Communications; 7/17/2024, Vol. 15 Issue 1, p1-9, 9p
Publication Year :
2024

Abstract

A two-dimensional (2D) Weyl semimetal, akin to a spinful variant of graphene, represents a topological matter characterized by Weyl fermion-like quasiparticles in low dimensions. The spinful linear band structure in two dimensions gives rise to distinctive topological properties, accompanied by the emergence of Fermi string edge states. We report the experimental realization of a 2D Weyl semimetal, bismuthene monolayer grown on SnS(Se) substrates. Using spin and angle-resolved photoemission and scanning tunneling spectroscopies, we directly observe spin-polarized Weyl cones, Weyl nodes, and Fermi strings, providing consistent evidence of their inherent topological characteristics. Our work opens the door for the experimental study of Weyl fermions in low-dimensional materials. 2D Weyl semimetals are spin-polarized analogues of graphene that promise access to various topological properties of matter. Here, the authors evidence spin-polarized Weyl cones, Weyl nodes, and Fermi strings in monolayer bismuthene. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20411723
Volume :
15
Issue :
1
Database :
Complementary Index
Journal :
Nature Communications
Publication Type :
Academic Journal
Accession number :
178504404
Full Text :
https://doi.org/10.1038/s41467-024-50329-6