扫描隧道显微镜
单斜晶系
单层
分子束外延
材料科学
外延
凝聚态物理
相(物质)
扫描隧道光谱
化学物理
量子点
纳米技术
结晶学
化学
物理
晶体结构
图层(电子)
有机化学
作者
Jinglei Chen,Guan-Yong Wang,Yanan Tang,Hao Tian,Junfeng Xu,Xianqi Dai,Hu Xu,Jinfeng Jia,Wingkin Ho,Maohai Xie
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-02-27
卷期号:11 (3): 3282-3288
被引量:48
标识
DOI:10.1021/acsnano.7b00556
摘要
Monolayer (ML) transition-metal dichalcogenides exist in different phases, such as hexagonal (2H) and monoclinic (1T') structures. They show very different properties: semiconducting for 2H-MoTe2 and semimetallic for 1T'-MoTe2. The formation energy difference between 2H- and 1T'-phase MoTe2 is small, so there is a high chance of tuning the structures of MoTe2 and thereby introducing applications of phase-change electronics. In this paper, we report the growth of both 2H- and 1T'-MoTe2 MLs by molecular-beam epitaxy (MBE) and demonstrate its tenability by changing the conditions of MBE. We attribute the latter to an effect of Te adsorption. By scanning tunneling microscopy and spectroscopy, we reveal not only the atomic structures and intrinsic electronic properties of the two phases of MoTe2 but also quantum confinement and quantum interference effects in the 2H- and 1T'-MoTe2 domains, respectively, as effected by domain boundaries in the samples.
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