Topological nodal-line fermions in spin-orbit metal PbTaSe2

被引：762

作者：

Bian, Guang ^{[1
]}

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

Sankar, Raman ^{[3
]}

Xu, Su-Yang ^{[1
]}

Zheng, Hao ^{[1
]}

Neupert, Titus ^{[1
,4
]}

Chiu, Ching-Kai ^{[5
]}

Huang, Shin-Ming ^{[6
,7
,8
]}

Chang, Guoqing ^{[6
,7
,8
]}

Belopolski, Ilya ^{[1
]}

Sanchez, Daniel S. ^{[1
]}

Neupane, Madhab ^{[1
]}

Alidoust, Nasser ^{[1
]}

Liu, Chang ^{[1
]}

Wang, BaoKai ^{[6
,7
,8
,9
]}

Lee, Chi-Cheng ^{[6
,7
,8
]}

Jeng, Horng-Tay ^{[2
,10
]}

Zhang, Chenglong ^{[11
]}

Yuan, Zhujun ^{[11
]}

Jia, Shuang ^{[11
]}

Bansil, Arun ^{[9
]}

Chou, Fangcheng ^{[3
]}

Lin, Hsin ^{[6
,7
,8
]}

Hasan, M. Zahid ^{[1
]}

机构：

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

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

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

[4] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

[5] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

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

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

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

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

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

[11] Peking Univ, Sch Phys, ICQM, Beijing 100871, Peoples R China

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

新加坡国家研究基金会;

关键词：

SURFACE; INSULATORS; SEMIMETAL; ARCS;

D O I：

10.1038/ncomms10556

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Topological semimetals can support one-dimensional Fermi lines or zero-dimensional Weyl points in momentum space, where the valence and conduction bands touch. While the degeneracy points in Weyl semimetals are robust against any perturbation that preserves translational symmetry, nodal lines require protection by additional crystalline symmetries such as mirror reflection. Here we report, based on a systematic theoretical study and a detailed experimental characterization, the existence of topological nodal-line states in the non-centrosymmetric compound PbTaSe2 with strong spin-orbit coupling. Remarkably, the spin-orbit nodal lines in PbTaSe2 are not only protected by the reflection symmetry but also characterized by an integer topological invariant. Our detailed angle-resolved photoemission measurements, first-principles simulations and theoretical topological analysis illustrate the physical mechanism underlying the formation of the topological nodal-line states and associated surface states for the first time, thus paving the way towards exploring the exotic properties of the topological nodal-line fermions in condensed matter systems.

引用

页数：8

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