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

被引：34

作者：

Xu, Su-Yang ^{[1
]}

Liu, Chang ^{[1
,2
]}

Belopolski, I. ^{[1
]}

Kushwaha, S. K. ^{[3
]}

Sankar, R. ^{[4
]}

Krizan, J. W. ^{[3
]}

Chang, T-R. ^{[5
]}

Polley, C. M. ^{[6
]}

Adell, J. ^{[6
]}

Balasubramanian, T. ^{[6
]}

Miyamoto, K. ^{[7
]}

Alidoust, N. ^{[1
]}

Bian, Guang ^{[1
]}

Neupane, M. ^{[1
]}

Jeng, H-T. ^{[5
,8
]}

Huang, C-Y. ^{[9
]}

Tsai, W-F. ^{[9
]}

Okuda, T. ^{[7
]}

Bansil, A. ^{[10
]}

Chou, F. C. ^{[4
]}

Cava, R. J. ^{[3
]}

Lin, H. ^{[11
,12
]}

Hasan, M. Z. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Spect B7, Princeton, NJ 08544 USA

[2] South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[4] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan

[5] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[6] Lund Univ, Max Lab, S-22100 Lund, Sweden

[7] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan

[8] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[9] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan

[10] Northeastern Univ, Dept Phys, Boston, MA 02115 USA

[11] Natl Univ Singapore, Graphene Res Ctr, Singapore 11754, Singapore

[12] Natl Univ Singapore, Dept Phys, Singapore 11754, Singapore

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 07期

基金：

新加坡国家研究基金会; 美国国家科学基金会; 瑞典研究理事会; 日本学术振兴会;

关键词：

QUANTUM SPIN HALL; PHASE-TRANSITION; INSULATOR; METAL; ELECTRON;

D O I：

10.1103/PhysRevB.92.075115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：7

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