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

Qiangsheng Lu, P. V. Sreenivasa Reddy, Hoyeon Jeon, Alessandro R. Mazza, Matthew Brahlek, Weikang Wu, Shengyuan A. Yang, Jacob Cook, Clayton Conner, Xiaoqian Zhang, Amarnath Chakraborty, Yueh-Ting Yao, Hung-Ju Tien, Chun-Han Tseng, Po-Yuan Yang, Shang-Wei Lien, Hsin Lin, Tai-Chang Chiang, Giovanni Vignale, An-Ping Li (), Tay-Rong Chang (), Rob G. Moore () and Guang Bian ()
Additional contact information
Qiangsheng Lu: University of Missouri
P. V. Sreenivasa Reddy: National Cheng Kung University
Hoyeon Jeon: Oak Ridge National Laboratory
Alessandro R. Mazza: Oak Ridge National Laboratory
Matthew Brahlek: Oak Ridge National Laboratory
Weikang Wu: Singapore University of Technology and Design
Shengyuan A. Yang: Singapore University of Technology and Design
Jacob Cook: University of Missouri
Clayton Conner: University of Missouri
Xiaoqian Zhang: University of Missouri
Amarnath Chakraborty: University of Missouri
Yueh-Ting Yao: National Cheng Kung University
Hung-Ju Tien: National Cheng Kung University
Chun-Han Tseng: National Cheng Kung University
Po-Yuan Yang: National Cheng Kung University
Shang-Wei Lien: National Cheng Kung University
Hsin Lin: Academia Sinica
Tai-Chang Chiang: University of Illinois at Urbana-Champaign
Giovanni Vignale: University of Missouri
An-Ping Li: Oak Ridge National Laboratory
Tay-Rong Chang: National Cheng Kung University
Rob G. Moore: Oak Ridge National Laboratory
Guang Bian: University of Missouri

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-50329-6

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