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

Xu, Su-Yang; Liu, Chang; Belopolski, I.; Kushwaha, S. K.; Sankar, R.; Krizan, J. W.; Chang, T-R.; Polley, Craig LU ; Adell, Johan LU and Thiagarajan, Balasubramanian LU , et al. (2015) In Physical Review B (Condensed Matter and Materials Physics) 92(7).
Abstract
A three-dimensional (3D) 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 ground state. Our studies 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. Our results identify an example of a band saddle-point singularity in 3D Dirac materials. This is in contrast to its two-dimensional analogs such as graphene and the Dirac surface states of a topological insulator.... (More)
A three-dimensional (3D) 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 ground state. Our studies 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. Our results identify an example of a band saddle-point singularity in 3D Dirac materials. This is in contrast to its two-dimensional analogs such as graphene and the 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 ground state. (Less)
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Physical Review B (Condensed Matter and Materials Physics)
volume
92
issue
7
publisher
American Physical Society
external identifiers
  • wos:000359344100002
  • scopus:84940093586
ISSN
1098-0121
DOI
10.1103/PhysRevB.92.075115
language
English
LU publication?
yes
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6cee5593-3661-4605-a724-d78c8ca31bf3 (old id 7975472)
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2015-09-24 08:49:03
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2017-10-22 04:11:09
@article{6cee5593-3661-4605-a724-d78c8ca31bf3,
  abstract     = {A three-dimensional (3D) 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 ground state. Our studies 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. Our results identify an example of a band saddle-point singularity in 3D Dirac materials. This is in contrast to its two-dimensional analogs such as graphene and the 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 ground state.},
  articleno    = {075115},
  author       = {Xu, Su-Yang and Liu, Chang and Belopolski, I. and Kushwaha, S. K. and Sankar, R. and Krizan, J. W. and Chang, T-R. and Polley, Craig and Adell, Johan and Thiagarajan, Balasubramanian and Miyamoto, K. and Alidoust, N. and Bian, Guang and Neupane, M. and Jeng, H-T. and Huang, C-Y. and Tsai, W-F. and Okuda, T. and Bansil, A. and Chou, F. C. and Cava, R. J. and Lin, H. and Hasan, M. Z.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {7},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal},
  url          = {http://dx.doi.org/10.1103/PhysRevB.92.075115},
  volume       = {92},
  year         = {2015},
}