Quantum Effects and Phase Tuning in Epitaxial Hexagonal and Monoclinic MoTe2 Monolayers

Chen, Jinglei1; Wang, Guanyong2,3; Tang, Yanan4,5; Tian, Hao1,6; Xu, Jinpeng1; Dai, Xianqi4,5; Xu, Hu6; Jia, Jinfeng2,3; Ho, Wingkin1; Xie, Maohai1

2017-03

10.1021/acsnano.7b00556

ACS Nano   影响因子和分区

1936-0851

1936-086X

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.

MoTe2 monolayer MBE STM/STS quantum effects phase transition

SCI ; EI

英语

NI论文

其他

NSFC[11521404] ; NSFC[11227404] ; NSFC[11504334] ; NSFC[U1404109]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000398014900094

AMER CHEMICAL SOC

20171403517918

Electronic properties ; Molecular beam epitaxy ; Monolayers ; Phase transitions ; Quantum electronics ; Quantum interference devices ; Scanning tunneling microscopy ; Transition metals ; Tuning

Metallurgy and Metallography:531 ; Compound Semiconducting Materials:712.1.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Physical Chemistry:801.4 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China
2.Shanghai Jiao Tong Univ, Ministry Educ, Dept Phys & Astron, Key Lab Artificial Structures & Quantum Control, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
3.Innovat Ctr Adv Microstruct, Nanjing 210023, Peoples R China
4.Henan Normal Univ, Coll Phys & Elect Engn, Xinxiang 453007, Herts, Peoples R China
5.Zhengzhou Normal Univ, Sch Phys & Elect Engn, Zhengzhou 450044, Herts, Peoples R China
6.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

Chen, Jinglei,Wang, Guanyong,Tang, Yanan,et al. Quantum Effects and Phase Tuning in Epitaxial Hexagonal and Monoclinic MoTe2 Monolayers[J]. ACS Nano,2017,11(3):3282-3288.

Chen, Jinglei.,Wang, Guanyong.,Tang, Yanan.,Tian, Hao.,Xu, Jinpeng.,...&Xie, Maohai.(2017).Quantum Effects and Phase Tuning in Epitaxial Hexagonal and Monoclinic MoTe2 Monolayers.ACS Nano,11(3),3282-3288.

Chen, Jinglei,et al."Quantum Effects and Phase Tuning in Epitaxial Hexagonal and Monoclinic MoTe2 Monolayers".ACS Nano 11.3(2017):3282-3288.