Probing spin dynamics from the Mott insulating to the superfluid regime in a dipolar lattice gas

TL;DR

This paper investigates the evolution of spin dynamics in a large spin dipolar Bose gas across the Mott insulator to superfluid transition, revealing a crossover from oscillatory to exponential behavior and highlighting complex interactions in the intermediate regime.

Contribution

It provides experimental data and theoretical analysis of spin dynamics during the Mott to superfluid transition, especially in the strongly correlated intermediate regime.

Findings

Observed a smooth crossover from oscillatory to exponential spin dynamics.

Identified the interplay of dipolar, contact, and super-exchange interactions.

Highlighted challenges in modeling coupled spin transport in strongly correlated regimes.

Abstract

We analyze the spin dynamics of an out-of-equilibrium large spin dipolar atomic Bose gas in an optical lattice. We observe a smooth crossover from a complex oscillatory behavior to an exponential behavior throughout the Mott to superfluid transition. While both of these regimes are well described by our theoretical models, we provide data in the intermediate regime where dipolar interactions, contact interactions, and super-exchange mechanisms compete. In this strongly correlated regime, spin dynamics and transport are coupled, which challenges theoretical models for quantum magnetism.