Direct visualization of a two-dimensional topological insulator in the single-layer 1T′-WTe2

被引：142

作者：

Jia, Zhen-Yu ^{[1
]}

Song, Ye-Heng ^{[1
]}

Li, Xiang-Bing ^{[1
]}

Ran, Kejing ^{[1
]}

Lu, Pengchao ^{[1
]}

Zheng, Hui-Jun ^{[1
]}

Zhu, Xin-Yang ^{[1
]}

Shi, Zhi-Qiang ^{[1
]}

Sun, Jian ^{[1
,2
]}

Wen, Jinsheng ^{[1
,2
]}

Xing, Dingyu ^{[1
,2
]}

Li, Shao-Chun ^{[1
,2
]}

机构：

[1] Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 04期

基金：

中国国家自然科学基金;

关键词：

HGTE QUANTUM-WELLS; TRANSITION; COHERENCE; STATE;

D O I：

10.1103/PhysRevB.96.041108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have grown nearly freestanding single-layer 1T'-WTe2 on graphitized 6H-SiC(0001) by using molecular beam epitaxy (MBE), and characterized its electronic structure with scanning tunnelingmicroscopy/spectroscopy (STM/STS). The existence of topological edge states at the periphery of single-layer WTe2 islands was confirmed. Surprisingly, a bulk band gap at the Fermi level and insulating behaviors were also found in single-layer WTe2 at low temperature, which are likely associated with an incommensurate charge order transition. The realization of two-dimensional topological insulators (2D TIs) in single-layer transition-metal dichalcogenide provides a promising platform for further exploration of the 2D TIs' physics and related applications.

引用

页数：5

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