Quantum phases of hard-core dipolar bosons in coupled 1D optical lattices

TL;DR

This paper investigates various quantum phases of hard-core dipolar bosons in coupled 1D optical lattices, revealing threshold-less phase formation driven by filling factors and introducing a new quantum Monte Carlo simulation method.

Contribution

It introduces an ab-initio quantum Monte Carlo algorithm to study complex phases of dipolar bosons in coupled 1D lattices, highlighting the role of filling factors.

Findings

Identification of superfluid, supercounterfluid, and insulator phases

Demonstration of threshold-less phase formation with respect to dipolar interaction

Development of a new quantum Monte Carlo simulation method

Abstract

Hard-core dipolar bosons trapped in a parallel stack of N>=2 1D optical lattices (tubes) can develop several phases made of composites of particles from different tubes: superfluids, supercounterfluids and insulators as well as mixtures of those. Bosonization analysis shows that these phases are threshold-less with respect to the dipolar interaction, with the key "control knob" being filling factors in each tube, provided the inter-tube tunneling is suppressed. The effective ab-initio quantum Monte Carlo algorithm capturing these phases is introduced and some results are presented.