Adiabatic melting of two-component Mott-insulator states

TL;DR

This paper studies how slowly reducing the optical lattice potential in a two-component Bose gas transforms local atom pair correlations into system-wide multiparticle correlations, enabling creation of macroscopic twin Fock states.

Contribution

It demonstrates a method to generate macroscopic twin Fock states from Mott insulator states via adiabatic melting, revealing the evolution of correlations during the transition.

Findings

Local correlations become multiparticle correlations across the system.

Superfluid states are highly depleted even from ground Mott states.

Method enables creation of macroscopic twin Fock states.

Abstract

We analyze the outcome of a Mott insulator to superfluid transition for a two-component Bose gas with two atoms per site in an optical lattice in the limit of slow ramping down the lattice potential. This manipulation of the initial Mott insulating state transforms local correlations between hyperfine states of atom pairs into multiparticle correlations extending over the whole system. We show how to create macroscopic twin Fock states in this way an that, in general, the obtained superfluid states are highly depleted even for initial ground Mott insulator states.