Type-II Symmetry-Protected Topological Dirac Semimetals

被引：162

作者：

Chang, Tay-Rong ^{[1
,2
]}

Xu, Su-Yang ^{[3
]}

Sanchez, Daniel S. ^{[3
]}

Tsai, Wei-Feng ^{[4
,5
,6
]}

Huang, Shin-Ming ^{[7
]}

Chang, Guoqing ^{[4
,5
,6
]}

Hsu, Chuang-Han ^{[4
,5
,6
]}

Bian, Guang ^{[3
]}

Belopolski, Ilya ^{[3
]}

Yu, Zhi-Ming ^{[8
,9
]}

Yang, Shengyuan A. ^{[9
]}

Neupert, Titus ^{[10
]}

Jeng, Horng-Tay ^{[1
,11
]}

Lin, Hsin ^{[4
,5
,6
]}

Hasan, M. Zahid ^{[3
]}

机构：

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

[2] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan

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

[4] Natl Univ Singapore, Ctr Adv Mat 2D, 6 Sci Dr 2, Singapore 117546, Singapore

[5] Natl Univ Singapore, Graphene Res Ctr, 6 Sci Dr 2, Singapore 117546, Singapore

[6] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117542, Singapore

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

[8] Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China

[9] Singapore Univ Technol & Design, Res Lab Quantum Mat, Singapore 487372, Singapore

[10] Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland

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

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 02期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

WEYL FERMION SEMIMETAL; STATE; DISCOVERY; SIGNATURES;

D O I：

10.1103/PhysRevLett.119.026404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The recent proposal of the type-II Weyl semimetal state has attracted significant interest. In this Letter, we propose the concept of the three-dimensional type-II Dirac fermion and theoretically identify this new symmetry-protected topological state in the large family of transition-metal icosagenides, MA(3) (M = V, Nb, Ta; A = Al, Ga, In). We show that the VAl3 family features a pair of strongly Lorentz-violating type-II Dirac nodes and that each Dirac node can be split into four type-II Weyl nodes with chiral charge +/- 1 via symmetry breaking. Furthermore, we predict that the Landau level spectrum arising from the type-II Dirac fermions in VAl3 is distinct from that of known Dirac or Weyl semimetals. We also demonstrate a topological phase transition from a type-II Dirac semimetal to a quadratic Weyl semimetal or a topological crystalline insulator via crystalline distortions.

引用

页数：6

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