Dipolar-Induced Resonance for Ultracold Bosons in a Quasi-1D Optical Lattice

TL;DR

This paper investigates how the Dipolar-Induced Resonance (DIR) influences the behavior of ultracold bosons in a quasi-1D optical lattice, revealing significant effects on phase transitions and system stability.

Contribution

It introduces a novel atom-dimer extended Bose-Hubbard model that accurately captures the effects of DIR in ultracold dipolar bosons within optical lattices.

Findings

DIR significantly alters the phase diagram at zero temperature.

Mass density wave appears in a narrow interaction domain.

Collapse phase occurs under strong dipolar interactions.

Abstract

We study the role of the Dipolar-Induced Resonance (DIR) in a quasi-one-dimensional system of ultracold bosons. We first describe the effect of the DIR on two particles in a harmonic trap. Then, we consider a deep optical lattice loaded with ultracold dipolar bosons. In order to describe this system, we introduce a novel atom-dimer extended Bose-Hubbard model, which is the minimal model correctly accounting for the DIR. We analyze the impact of the DIR on the phase diagram at T=0 by exact diagonalization of a small-sized system. We show that the DIR strongly affects this phase diagram. In particular, we predict the mass density wave to occur in a narrow domain corresponding to weak nearest-neighbor interactions, and the occurrence of a collapse phase for stronger dipolar interactions.