A numerical renormalization group study of laser induced freezing

TL;DR

This paper uses a numerical renormalization approach to study laser induced freezing in a 2D hard disk system, providing detailed phase diagrams and emphasizing the importance of higher-order defect contributions.

Contribution

It introduces a renormalization scheme that explicitly compares with defect mediated melting theory and accurately determines phase boundaries using Monte Carlo data.

Findings

Phase diagram matches previous simulations

Third-order defect fugacity is necessary for accurate results

Explicit dislocation parameters are obtained from constrained simulations

Abstract

We study the phenomenon of laser induced freezing, within a numerical renormalization scheme which allows explicit comparison with a recent defect mediated melting theory. Precise values for the `bare' dislocation fugacities and elastic moduli of the 2-d hard disk system are obtained from a constrained Monte Carlo simulation sampling only configurations {\em without} dislocations. These are used as inputs to appropriate renormalization flow equations to obtain the equilibrium phase diagram which shows excellent agreement with earlier simulation results. We show that the flow equations need to be correct at least up to third order in defect fugacity to reproduce meaningful results.