Topology-Driven Magnetic Quantum Phase Transition in Topological Insulators

被引：210

作者：

Zhang, Jinsong ^{[1
]}

Chang, Cui-Zu ^{[1
,2
]}

Tang, Peizhe ^{[1
]}

Zhang, Zuocheng ^{[1
]}

Feng, Xiao ^{[2
]}

Li, Kang ^{[2
]}

Wang, Li-li ^{[2
]}

Chen, Xi ^{[1
]}

Liu, Chaoxing ^{[3
]}

Duan, Wenhui ^{[1
]}

He, Ke ^{[2
]}

Xue, Qi-Kun ^{[1
,2
]}

Ma, Xucun ^{[2
]}

Wang, Yayu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

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

[3] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

来源：

SCIENCE | 2013年 / 339卷 / 6127期

基金：

英国工程与自然科学研究理事会;

关键词：

SINGLE DIRAC CONE; SURFACE; FERMIONS;

D O I：

10.1126/science.1230905

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：

The breaking of time reversal symmetry in topological insulators may create previously unknown quantum effects. We observed a magnetic quantum phase transition in Cr-doped Bi-2(SexTe1-x)(3) topological insulator films grown by means of molecular beam epitaxy. Across the critical point, a topological quantum phase transition is revealed through both angle-resolved photoemission measurements and density functional theory calculations. We present strong evidence that the bulk band topology is the fundamental driving force for the magnetic quantum phase transition. The tunable topological and magnetic properties in this system are well suited for realizing the exotic topological quantum phenomena in magnetic topological insulators.

引用

页码：1582 / 1586

页数：6

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