Extended Bose-Hubbard models with Rydberg macrodimer dressing

TL;DR

This paper proposes using Rydberg macrodimer dressing in bosonic gases to realize extended Bose-Hubbard models, demonstrating the emergence of a supersolid phase through theoretical modeling and simulations.

Contribution

It introduces a two-color excitation scheme to enhance dressed interactions and cancels Stark shifts, enabling exploration of novel quantum phases in extended Bose-Hubbard models.

Findings

Identification of a supersolid phase via Rydberg dressing.

Development of a two-color excitation scheme to increase interaction strength.

Simulation of phase transitions using Cluster Gutzwiller and Lindblad methods.

Abstract

Extended Hubbard models have proven to bear novel quantum states, 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 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 AC Stark shifts limiting the atomic motion in the itinerant regime. 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.