Ground-state properties of a one-dimensional system of dipoles

TL;DR

This study investigates a 1D dipolar Bose system at zero temperature, revealing a transition from fermion-like to solid-like behavior, with superfluidity on the liquid side and normal fluid on the solid side, using Quantum Monte Carlo methods.

Contribution

It demonstrates a quantum crossover in a 1D dipolar Bose system, combining Quantum and Variational Monte Carlo techniques to explore phase behavior and properties at various densities.

Findings

At low density, the system behaves like non-interacting fermions.

A crossover from liquid-like to solid-like state occurs at higher densities.

The system exhibits superfluidity on the liquid side and normal fluid behavior on the solid side.

Abstract

A one-dimensional (1D) Bose system with dipole-dipole repulsion is studied at zero temperature by means of a Quantum Monte Carlo method. It is shown that in the limit of small linear density the bosonic system of dipole moments acquires many properties of a system of non-interacting fermions. At larger linear densities a Variational Monte Carlo calculation suggests a crossover from a liquid-like to a solid-like state. The system is superfluid on the liquid-like side of the crossover and is normal in the deep on the solid-like side. Energy and structural functions are presented for a wide range of densities. Possible realizations of the model are 1D Bose atom systems with permanent dipoles or dipoles induced by static field or resonance radiation, or indirect excitons in coupled quantum wires, etc. We propose parameters of a possible experiment and discuss manifestations of the zero-temperature quantum crossover.