Evidence for a quantum spin Hall phase in graphene decorated with Bi2Te3 nanoparticles

被引：41

作者：

Hatsuda, K. ^{[1
]}

Mine, H. ^{[1
]}

Nakamura, T. ^{[2
]}

Li, J. ^{[3
]}

Wu, R. ^{[3
]}

Katsumoto, S. ^{[2
]}

Haruyama, J. ^{[1
,2
]}

机构：

[1] Aoyama Gakuin Univ, Fac Sci & Engn, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan

[2] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778581, Japan

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

SCIENCE ADVANCES | 2018年 / 4卷 / 11期

关键词：

TOTAL-ENERGY CALCULATIONS; TRANSITION; TRANSPORT;

D O I：

10.1126/sciadv.aau6915

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：

Realization of the quantum spin Hall effect in graphene devices has remained an outstanding challenge dating back to the inception of the field of topological insulators. Graphene's exceptionally weak spin-orbit coupling-stemming from carbon's low mass-poses the primary obstacle. We experimentally and theoretically study artificially enhanced spin-orbit coupling in graphene via random decoration with dilute Bi2Te3 nanoparticles. Multiterminal resistance measurements suggest the presence of helical edge states characteristic of a quantum spin Hall phase; the magnetic field and temperature dependence of the resistance peaks, x-ray photoelectron spectra, scanning tunneling spectroscopy, and first-principles calculations further support this scenario. These observations highlight a pathway to spintronics and quantum information applications in graphene-based quantum spin Hall platforms.

引用

页数：6

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