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.
@article{arxiv.1407.5744,
title = {Dense network of one-dimensional mid-gap metallic modes in monolayer MoSe2 and their spatial undulations},
author = {Hongjun Liu and Lu Jiao and Fang Yang and Yuan Cai and Xianxin Wu and Wingkin Ho and Chunlei Gao and Jinfeng Jia and Ning Wang and Heng Fan and Wang Yao and Maohai Xie},
journal= {arXiv preprint arXiv:1407.5744},
year = {2014}
}