Quantum Point Contacts and Interferometry in Correlated Topological States of Two-Dimensional Semiconductors

Heterostructures of two-dimensional semiconductors can host a fascinating variety of correlated and topological states, ranging from excitonic insulators to Kondo lattices and the recently observed fractional quantum anomalous Hall seen in twisted homobilayers of MoTe2. These systems offer the potential to control the spatial variation of the electronic phase locally using patterned gates. One ccould use this, for example, to create quantum point contacts and interferometers for investigating boundaries between phases, excitation spectra, and exchange statistics of the excitations. We will report on our progress towards patterned gating, as well as improved contacts, in two-dimensional semiconductor systems.