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

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; Chang, Tay-Rong; Moore, Rob G.; Bian, Guang

doi:10.1038/s41467-024-50329-6

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

Journal Article · Wed Jul 17 00:00:00 UTC 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-50329-6 · OSTI ID:2403556

Lu, Qiangsheng;

;

; Mazza, Alessandro R.;

;

; Yang, Shengyuan A.; Cook, Jacob; Conner, Clayton; Zhang, Xiaoqian; Chakraborty, Amarnath; Yao, Yueh-Ting;

; Tseng, Chun-Han; Yang, Po-Yuan; Lien, Shang-Wei;

;

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725; FG02-07ER46383; SC0024294

OSTI ID:: 2403556

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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