Two-dimensional quantum transport of multivalley (111) surface state in topological crystalline insulator SnTe thin films

被引：46

作者：

Akiyama, Ryota ^{[1
,2
]}

Fujisawa, Kazuki ^{[1
]}

Yamaguchi, Tomonari ^{[1
]}

Ishikawa, Ryo ^{[1
]}

Kuroda, Shinji ^{[1
]}

机构：

[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

[2] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

来源：

NANO RESEARCH | 2016年 / 9卷 / 02期

基金：

日本学术振兴会;

关键词：

SnTe (111) films; topological crystalline insulators; weak antilocalization; phase coherence length; Dirac valleys;

D O I：

10.1007/s12274-015-0930-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The magneto-transport properties of (111)-oriented single-crystal thin films of SnTe were investigated. SnTe (111) thin films were epitaxially grown on a BaF2 substrate by molecular beam epitaxy. By optimizing the growth conditions and the thickness of the films, the bulk carrier density could be reduced, making it possible to detect the surface transport. Magneto-conductance (MC) measurements show a cusp-like feature around zero magnetic field, which is attributed to the weak-antilocalization effect of the transport in the topological surface state. Detailed analysis of this negative MC reveals a reduced number of transport channels contributing to the surface transport, suggesting strong coupling between Dirac valleys on the SnTe (111) surface, as a characteristic feature of the transport in the multivalley structure of topological crystalline insulators.

引用

页码：490 / 498

页数：9

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