Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2

被引：1238

作者：

Neupane, Madhab ^{[1
]}

Xu, Su-Yang ^{[1
]}

Sankar, Raman ^{[2
]}

Alidoust, Nasser ^{[1
]}

Bian, Guang ^{[1
]}

Liu, Chang ^{[1
]}

Belopolski, Ilya ^{[1
]}

Chang, Tay-Rong ^{[3
]}

Jeng, Horng-Tay ^{[3
,4
]}

Lin, Hsin ^{[5
]}

Bansil, Arun ^{[6
]}

Chou, Fangcheng ^{[2
]}

Hasan, M. Zahid ^{[1
,7
]}

机构：

[1] Princeton Univ, Dept Phys, Joseph Henry Lab, Princeton, NJ 08544 USA

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

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

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

[5] Natl Univ Singapore, Graphene Res Ctr, Dept Phys, Singapore 117542, Singapore

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

[7] Princeton Univ, Princeton Ctr Complex Mat, Princeton, NJ 08544 USA

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

QUANTUM SPIN HALL; INSULATOR; TRANSITION; DYNAMICS; FERMIONS;

D O I：

10.1038/ncomms4786

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：

Symmetry-broken three-dimensional (3D) topological Dirac semimetal systems with strong spin-orbit coupling can host many exotic Hall-like phenomena and Weyl fermion quantum transport. Here, using high-resolution angle-resolved photoemission spectroscopy, we performed systematic electronic structure studies on Cd3As2, which has been predicted to be the parent material, from which many unusual topological phases can be derived. We observe a highly linear bulk band crossing to form a 3D dispersive Dirac cone projected at the Brillouin zone centre by studying the (001)-cleaved surface. Remarkably, an unusually high in-plane Fermi velocity up to 1.5 x 10(6) ms(-1) is observed in our samples, where the mobility is known up to 40,000 cm(2)V(-1)s(-1), suggesting that Cd3As2 can be a promising candidate as an anisotropic-hypercone (three-dimensional) high spin-orbit analogue of 3D graphene. Our discovery of the Dirac-like bulk topological semimetal phase in Cd3As2 opens the door for exploring higher dimensional spin-orbit Dirac physics in a real material.

引用

页数：8

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