Speaker
Description
Transition metal dichalcogenides like molybdenum disulfide (MoS$_2$) have been studied on metal surfaces, but little is known about twist angle-dependent electronic properties of these simple heterostructures, which indeed offers tremendous opportunities to design functional quantum materials. In this talk, I will present a detailed scanning tunneling microscopy and spectroscopy investigation of the electronic properties of monolayer MoS$_2$ on gold as a function of twist angle. We find that the semi-conducting band edges and hence the band gap are modulated at the moiré wavelength (moiré between MoS$_2$ and gold) and this modulation progressively vanishes with increasing twist angle. We explain our findings in terms of hybridization between the nearest gold and sulfur atoms, which becomes spatially homogeneous with an increase in the twist angle.
