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Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal

Author(s): Xu, Su-Yang; Liu, Chang; Belopolski, Ilya; Kushwaha, SK; Sankar, R; et al

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Abstract: A topological Dirac semimetal is a novel state of quantum matter which has recently attracted much attention as an apparent 3D version of graphene. In this paper, we report results on the electronic structure of the 3D Dirac semimetal Na3Bi at a surface that reveals its nontrivial groundstate. Our studies, for the first time, reveal that the two 3D Dirac cones go through a topological change in the constant energy contour as a function of the binding energy, featuring a Lifshitz point, which is missing in a strict 3D analog of graphene (in other words, Na3Bi is not a true analog of 3D graphene). Our results identify the first example of a band saddle point singularity in 3D Dirac materials. This is in contrast to its 2D analogs such as graphene and the helical Dirac surface states of a topological insulator. The observation of multiple Dirac nodes in Na3Bi connecting via a Lifshitz point along its crystalline rotational axis away from the Kramers point serves as a decisive signature for the symmetry-protected nature of the Dirac semimetal’s topological bulk groundstate.
Publication Date: Aug-2015
Electronic Publication Date: 10-Aug-2015
Citation: Xu, Su-Yang, Liu, Chang, Belopolski, I, Kushwaha, SK, Sankar, R, Krizan, JW, Chang, T-R, Polley, CM, Adell, J, Balasubramanian, T, Miyamoto, K, Alidoust, N, Bian, Guang, Neupane, M, Jeng, H-T, Huang, C-Y, Tsai, W-F, Okuda, T, Bansil, A, Chou, FC, Cava, RJ, Lin, H, Hasan, MZ. (2015). Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal. Physical Review B, 92 (7), 10.1103/PhysRevB.92.075115
DOI: doi:10.1103/PhysRevB.92.075115
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 1 - 5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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