Abstract: Unconventional phases in solids are predicted to arise when a Fermi surface is strongly coupled to bosonic excitations, such as phonons, spin- and density-wave fluctuations, and collective modes emerging in the vicinity of phase transitions. However, isolating relevant interaction channels is challenging, as electrons are typically coupled simultaneously to multiple bosonic modes. This motivates the exploration of Bose-Fermi mixtures in more controlled settings, for example with transition-metal-dichalcogenide (TMD) heterostructures in which fermionic charge carriers are coupled to long-lived bosonic interlayer excitons. In this talk, we will show how tunable interactions between charge carriers and excitons can be realized with a solid-state Feshbach resonance [1]. The Feshbach resonance allows for realizing strongly correlated Bose-Fermi mixtures in TMD heterostructures. Tuning the interactions across the Feshbach resonance gives rise to exotic transport phenomena even at intermediate temperatures that are dominated by many-body scattering instead of conventional scattering mechanisms [2]. For low temperatures we further predict that the system can even become unstable toward topological p+ip superconductivity [3]. We will moreover cover some recent experimental progress towards realizing these Bose-Fermi mixtures [4]. Our results demonstrate the potential for TMD heterostructures to realize and control exotic correlated quantum many-body states in previously unaccessible regimes.
[1] Kuhlenkamp, et al, PRL, (2022)
[2] Zerba, Kuhlenkamp, Mangeolle, MK, PRL (2025)
[3] Zerba, Kuhlenkamp, Imamoglu, MK, PRL (2024)
[4] Ben Mhenni, Kadow, et al. arxiv:2410.07308