Discovery of a Three-Dimensional Topological Dirac Semimetal, Na3Bi

被引：2014

作者：

Liu, Z. K. ^{[1
]}

Zhou, B. ^{[2
,3
]}

Zhang, Y. ^{[3
]}

Wang, Z. J. ^{[4
,5
]}

Weng, H. M. ^{[4
,5
,6
]}

Prabhakaran, D. ^{[2
]}

Mo, S-K ^{[3
]}

Shen, Z. X. ^{[1
]}

Fang, Z. ^{[4
,5
,6
]}

Dai, X. ^{[4
,5
,6
]}

Hussain, Z. ^{[3
]}

Chen, Y. L. ^{[2
,7
,8
]}

机构：

[1] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[5] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[6] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[7] Diamond Light Source, Didcot, Oxon, England

[8] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

来源：

SCIENCE | 2014年 / 343卷 / 6173期

基金：

英国工程与自然科学研究理事会;

关键词：

INSULATORS; GRAPHENE; PHASE;

D O I：

10.1126/science.1245085

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：

Three-dimensional (3D) topological Dirac semimetals (TDSs) represent an unusual state of quantum matter that can be viewed as "3D graphene." In contrast to 2D Dirac fermions in graphene or on the surface of 3D topological insulators, TDSs possess 3D Dirac fermions in the bulk. By investigating the electronic structure of Na3Bi with angle-resolved photoemission spectroscopy, we detected 3D Dirac fermions with linear dispersions along all momentum directions. Furthermore, we demonstrated the robustness of 3D Dirac fermions in Na3Bi against in situ surface doping. Our results establish Na3Bi as a model system for 3D TDSs, which can serve as an ideal platform for the systematic study of quantum phase transitions between rich topological quantum states.

引用

页码：864 / 867

页数：4

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