Dense network of one-dimensional mid-gap 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 MoSe2 grown by molecular-beam epitaxy. High-resolution transmission electron microscopy and scanning tunneling microscopy and spectroscopy (STM/STS) studies show these 1D modes are mid-gap states at inversion domain boundaries. STM/STS measurements further reveal intensity undulations of the metallic modes, presumably arising from the superlattice potentials due to moire pattern and the quantum confinement effect. A dense network of the metallic modes with high density of states is of great potential for heterocatalysis applications. The interconnection of such mid-gap 1D conducting channels may also imply new transport behaviors distinct from the 2D bulk.

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• Visualizing Band Offsets and Edge States in Bilayer-Monolayer Transition Metal Dichalcogenides Lateral Heterojunction
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• Inversion Domain Boundary Induced Stacking and Bandstructure Diversity in Bilayer MoSe2
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• Localized defect states in MoS${}_2$ monolayers: electronic and optical properties
• Direct Observation of One-Dimensional Peierls-Type Charge Density Wave in Twin Boundaries of Monolayer MoTe${}_2$
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• Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
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• Green${}^{\prime }$s function approach to edge states in transition metal dichalcogenides
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• Robust one-dimensionality at twin-grain-boundaries in MoSe${}_2$
• Nonlinear optical response in kagome lattice with inversion symmetry breaking
• Atomic ordering and phase separation in lateral heterostructures and multijunctions of ternary two-dimensional hexagonal materials
• Graphene-driven correlated electronic states in one dimensional defects within WS${}_2$