Monday, August 19, 2019, 1:00 pm — Bldg. 735, CFN 1st floor conference room
Abstract: Low temperature scanning tunneling microscope (STM) has become an indispensable research tool in surface science. We developed state of the art cryogen-free variable temperature STM, which can run continuously for months without consuming liquid helium and is capable of inelastic tunneling spectroscopy (STM-IETS) on a single molecule. We apply this powerful STM to investigate the Group IV transition metal dichalcogenides (TMDs), emerging as a family of intrinsic two-dimensional semiconductors. In this talk, first, I will introduce our recent progress in study of the point defect in WSe2 monolayer by using low temperature STM and spectroscopy (STS), in corroboration with density functional theory calculations. The atomic and electronic structure of dominant defect in WSe2 and the origin of localized exciton are unveiled. Next, I will show the STM study of the TMDs heterostructure. The Moire potential, electron tunneling across the van der Waals gap and the tunable band alignment are highlighted.
Hosted by: Jurek Sadowski
15162 | INT/EXT | Events Calendar
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