Proposal for exciton interferometry in transition metal dichalchogenide heterobilayers

Transition Metal Dichalcogenides (TMDs) are a class of van der Waals semiconducting heterostructures with a direct bandgap that can be stacked to form heterobilayers. When a bias voltage is applied, a type-II band alignment emerges. Due to the strong Coulomb binding energy, electrons and holes localized in different layers can form interlayer excitons. In this talk, we propose the realization of exciton interferometry in this system through the Aharonov–Casher effect. This effect consists of a phase shift experienced by a neutral particle with a magnetic dipole moment when it circulates around the source of an external static electric field. We show that interlayer excitons can have a finite magnetic dipole moment that emerges from the quantum geometry of the bands. We address the experimental signatures of exciton interferometry for biased bilayer structures.