Clustered Superfluids in the One Dimensional Bose-Hubbard model with extended correlated hopping

TL;DR

This paper investigates the effects of extended correlated hopping in a one-dimensional Bose-Hubbard model, revealing a complex phase diagram with novel clustered superfluid phases alongside traditional Mott and superfluid states.

Contribution

It introduces a comprehensive analysis of extended correlated hopping effects, uncovering new clustered superfluid phases in the 1D Bose-Hubbard model.

Findings

Identification of clustered superfluid phases

Rich ground state phase diagram including Mott and superfluid states

Use of exact diagonalization, strong coupling expansion, and cluster mean field theory

Abstract

Bosonic lattice systems with non-trivial interactions represent an intriguing platform to study exotic phases of matter. Here, we study the effects of extended correlated hopping processes in a system of bosons trapped in a lattice geometry. The interplay between single particle tunneling terms, correlated hopping processes and on-site repulsion is studied by means of a combination of exact diagonalization, strong coupling expansion and cluster mean field theory. We identify a rich ground state phase diagram where, apart the usual Mott and superfluid states, superfluid phases with interesting clustering properties occur.