Marcel Wagner and Richard have a new preprint on ArXiv titled “Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors”!

Abstract:

Feshbach resonances are an invaluable tool in atomic physics, enabling precise control of interactions and the preparation of complex quantum phases of matter. Here, we theoretically analyze a solid-state analogue of a Feshbach resonance in two dimensional semiconductor heterostructures. In the presence of inter-layer electron tunneling, the scattering of excitons and electrons occupying different layers can be resonantly enhanced by tuning an applied electric field. The emergence of an inter-layer Feshbach molecule modifies the optical excitation spectrum, and can be understood in terms of Fermi polaron formation. We discuss potential implications for the realization of correlated Bose-Fermi mixtures in bilayer semiconductors.

Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors

• C. Kuhlenkamp, M. Knap, M. Wagner, R. Schmidt, A. Imamoglu, Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors, arXiv:2105.01080