title: Dense network of one-dimensional midgap metallic modes in monolayer MoSe2 and their spatial undulations.
abstract: We report the observation of a dense triangular network of one-dimensional (1D) metallic modes in a continuous and uniform monolayer of MoSe(2) grown by molecular-beam epitaxy. High-resolution transmission electron microscopy and scanning tunneling microscopy and spectroscopy studies show that these 1D modes are midgap states at inversion domain boundaries. Scanning tunneling microscopy and spectroscopy measurements further reveal intensity undulations of the metallic modes, presumably arising from the superlattice potentials due to the moiré pattern and the quantum confinement effect. A dense network of the metallic modes with a high density of states is of great potential for heterocatalysis applications. The interconnection of such midgap 1D conducting channels may also imply new transport behaviors distinct from the 2D bulk.
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Hongjun
authors.initials: H
authors.lastname: Liu
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Lu
authors.initials: L
authors.lastname: Jiao
authors.affiliation: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.affiliation: Physics Department, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cai
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xianxin
authors.initials: X
authors.lastname: Wu
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Wingkin
authors.initials: W
authors.lastname: Ho
authors.affiliation: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Chunlei
authors.initials: C
authors.lastname: Gao
authors.affiliation: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Jinfeng
authors.initials: J
authors.lastname: Jia
authors.affiliation: Physics Department, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Heng
authors.initials: H
authors.lastname: Fan
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Wang
authors.initials: W
authors.lastname: Yao
authors.affiliation: Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Maohai
authors.initials: M
authors.lastname: Xie