Atomically structural variation in monolayer transition metal dichalcogenide by metal-induced doping effect

HUNG-CHANG HSU^1*, LIANG-YU CHEN¹, HAO-YU CHEN², YI-FENG CHEN², YA-PING CHIU^1,2

¹Department of Physics, National Taiwan University, Taipei, Taiwan
²Graduate School of Advanced Technology, National Taiwan University, Taipei, Taiwan

* Presenter:HUNG-CHANG HSU, email:Hsiuta617@gmail.com

Two-dimensional transition metal dichalcogenides (2D-TMDs) with polymorphs feature can evolve from semiconductor to metallic crystal structures by electron doping. The many-body effect induces collective ordering, such as charge density wave and superconductivity. In this work, we measured the TMDs/metal heterostructure using scanning tunneling microscopy and spectroscopy (STM/S). The results show that the TMDs conduction band bent down by metal substrate. Furthermore, the lattice variation with corresponding electronic modulation observed in topography and dI/dV images indicated the quasiparticle interaction takes place on the conduction band of TMDs. Understanding such a collective ordering has been widely supposed to be a key to unraveling the quasiparticle band structures in the quantum-confined 2D limit.

Keywords: scanning tunneling microscopy, transition metal dichalcogenide, electron doping