Variational study of hard-core bosons in a 2-D optical lattice using Projected Entangled Pair States (PEPS)

TL;DR

This paper employs a variational PEPS approach to analyze the ground state and dynamic responses of hard-core bosons in a 2-D optical lattice, providing insights beyond mean-field approximations.

Contribution

It introduces a PEPS-based variational method to study 2-D hard-core bosons, offering a more accurate analysis than traditional mean-field approaches.

Findings

PEPS captures ground state properties effectively.

System responds significantly to parameter changes.

Results differ from mean-field predictions.

Abstract

We have studied the system of hard-core bosons on a 2-D optical lattice using a variational algorithm based on projected entangled-pair states (PEPS). We have investigated the ground state properties of the system as well as the responses of the system to sudden changes in the parameters. We have compared our results to mean field results based on a Gutzwiller ansatz.