Extended Bose-Hubbard models with Rydberg macrodimer dressing

Extended Hubbard models have proven to bear novel phases of matter, but their experimental realization remains challenging. In this work we propose to use bosonic quantum gases dressed with molecular bound states in Rydberg interaction potentials for the observation of these quantum states. We study the molecular Rabi coupling with respect to the effective principal quantum number and trapping frequency of the ground-state atoms for various molecular potentials of rubidium and potassium, and the hereby resulting dressed interaction strength. Additionally, we propose a two-color excitation scheme which significantly increases the dressed interaction and cancels otherwise-limiting ac Stark shifts. We study the various equilibrium phases of the corresponding extended Bose-Hubbard model by means of the cluster Gutzwiller approach and perform time evolution simulations via the Lindblad master equation. We find a supersolid phase by slowly ramping the molecular Rabi coupling of an initially prepared superfluid and discuss the role of dissipation.

Automated summary

This work proposes the use of bosonic quantum gases dressed with molecular bound states in Rydberg interaction potentials to observe novel phases of matter in extended Hubbard models. It studies the molecular Rabi coupling with respect to the effective principal quantum number and trapping frequency of ground-state atoms, as well as the resulting dressed interaction strength. Additionally, a two-color excitation scheme is proposed to enhance dressed interaction and cancel ac Stark shifts.