Local Capacitance Measurements of WSe₂

We have developed a local capacitance technique using capacitively coupled electrodes to study the electronic properties of transition metal dichalcogenide materials. This approach does not rely on making ohmic contacts to the material and thus makes measurements at low temperature and low density possible presenting a significant advantage over conventional dc transport. Our local capacitance technique provides sensitivity to layer polarization in bilayer systems as the density and displacement field can be varied independently under the local measurement electrode. We have implemented our technique to study monolayer and bilayer WSe₂ in which contact resistance has been a major impediment to transport measurements. In this talk, we will present the results of our local capacitance techniques down to low carrier densities (< 10¹² cm^-2) and temperatures and high magnetic fields.