heterostructures

2D semiconductors have attracted a great deal of attention due to their unique properties including strong spin-orbit coupling, large effective mass and high tunability. However, quantum transport studies have been complicated by the difficulties in making Ohmic contacts. Non-ideal contacts also limit studies in more complex structures such as twisted bilayers and double-layers which may host interesting correlated phases. Here we report on magneto-capacitance measurements on WSe₂ heterostructures which probe the bulk electronic compressibility. This approach has a much lower requirement on the contact quality and allows improved resolution of both zero-field and finite field features, and over a wider range of density than previously accessible.