Realization of unpinned two-dimensional dirac states in antimony atomic layers

Qiangsheng Lu, Jacob Cook, Xiaoqian Zhang, Kyle Y. Chen, Matthew Snyder, Duy Tung Nguyen, P. V. Sreenivasa Reddy, Bingchao Qin, Shaoping Zhan, Li-Dong Zhao, Pawel J. Kowalczyk (), Simon A. Brown, Tai-Chang Chiang, Shengyuan A. Yang, Tay-Rong Chang and Guang Bian ()
Additional contact information
Qiangsheng Lu: University of Missouri
Jacob Cook: University of Missouri
Xiaoqian Zhang: University of Missouri
Kyle Y. Chen: Rock Bridge High School
Matthew Snyder: University of Missouri
Duy Tung Nguyen: University of Missouri
P. V. Sreenivasa Reddy: National Cheng Kung University
Bingchao Qin: Beihang University
Shaoping Zhan: Beihang University
Li-Dong Zhao: Beihang University
Pawel J. Kowalczyk: University of Lodz
Simon A. Brown: University of Canterbury
Tai-Chang Chiang: University of Illinois at Urbana-Champaign
Shengyuan A. Yang: Singapore University of Technology and Design
Tay-Rong Chang: National Cheng Kung University
Guang Bian: University of Missouri

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Two-dimensional (2D) Dirac states with linear dispersion have been observed in graphene and on the surface of topological insulators. 2D Dirac states discovered so far are exclusively pinned at high-symmetry points of the Brillouin zone, for example, surface Dirac states at $$\overline{{{\Gamma }}}$$ Γ ¯ in topological insulators Bi2Se(Te)3 and Dirac cones at K and $$K^{\prime}$$ K ′ points in graphene. The low-energy dispersion of those Dirac states are isotropic due to the constraints of crystal symmetries. In this work, we report the observation of novel 2D Dirac states in antimony atomic layers with phosphorene structure. The Dirac states in the antimony films are located at generic momentum points. This unpinned nature enables versatile ways such as lattice strains to control the locations of the Dirac points in momentum space. In addition, dispersions around the unpinned Dirac points are highly anisotropic due to the reduced symmetry of generic momentum points. The exotic properties of unpinned Dirac states make antimony atomic layers a new type of 2D Dirac semimetals that are distinct from graphene.

Date: 2022
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DOI: 10.1038/s41467-022-32327-8

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