Microwave reactance spectroscopy in two-dimensional materials

The interplay of low-dimensionality and strong correlations can give rise to novel gapped ground states in graphene and transition metal dichalcogenide heterostructures. These states include symmetry-broken correlated insulators, topological insulators, and unconventional superconductors. While DC resistance measurements have been widely used to study these systems, reactance measurements in the microwave regime can shed new light on these phases and the phase-transitions between them. In this talk, I will discuss the design of a radio frequency (RF) reflectometry setup adapted for capacitance and inductance measurements in 2D materials. Challenges associated with microwave measurements in 2D devices such as large contact resistances, RF leakage, impedance matching, and device design are addressed. Preliminary measurement results are discussed.