Functional Integration in Bose Systems with Hard-Core Interaction

TL;DR

This paper investigates the phase diagram of interacting bosons with hard-core interactions at zero temperature, identifying superfluid, normal fluid, and Mott insulator phases using mean-field functional integral methods.

Contribution

It introduces a mean-field functional integral approach to analyze phase transitions in hard-core boson systems at zero temperature.

Findings

Identified three distinct phases: superfluid, normal fluid, Mott insulator.

Mapped the zero temperature phase diagram of the system.

Used mean-field approximation to evaluate phase boundaries.

Abstract

A grand canonical ensemble of interacting bosons is considered. The zero temperature phase diagram is evaluated from the mean-field approximation of the functional integral. Three phases are found: a superfluid, a normal fluid and a Mott insulator.