Grad Talk: Fabrication and Electronic Properties of Twisted 2D heterostructures

Abstract: The study of moiré potentials in 2D materials has grown due to the discovery of superconductivity and correlated electronic states at low temperatures in easily tunable systems. Understanding the novel physics behind these moiré potentials incites the opportunity of finding new applications for known material. This talk focuses on fabricating twisted bilayer Graphene and TMD-TMD heterostructure devices, particularly twisted MoSe_2/WSe2, for measurements with gate-tunable Scanning Tunneling Microscopy/Spectroscopy (STM/STS) to collect information on the electronic structures of the samples at various filling factors. Using (STM/STS) to collect topological and spectroscopic data as well as local density of states maps (LDOS) at temperatures around 4.6 K, two-dimensional twisted bilayer Graphene and TMD-TMD heterostructure are probed to explore the structure and electronic properties of the devices. Some of these properties include stacking order, moiré wavelength, localization of electrons, wave function symmetries, band alignment, energy modulations in the bands due to stacking symmetries, and evidence of correlated behavior, insulating electronic states, and superconductivity.

Zoom Link: https://arizona.zoom.us/j/93847461477?pwd=V01rSkxOYm83NmNmVjFHQUptcGRNdz09