Thermally Increasing Correlation/Modulation Lengths and Other Selection Rules in Systems with Long Range Interactions

TL;DR

This paper investigates how correlation and modulation lengths in systems with long-range interactions change with temperature, revealing selection rules and behaviors that depend on competing interactions, exemplified by Coulomb and short-range forces.

Contribution

It introduces new insights into the temperature dependence of correlation lengths and establishes selection rules based on the interplay of long and short-range interactions.

Findings

Correlation lengths often increase with temperature and diverge at high temperatures.

Correlation magnitudes decrease as temperature rises.

Behavior of correlation lengths provides rules for underlying microscopic interactions.

Abstract

In this article, addressing large $n$ systems, we report that in numerous systems hosting long and short range interactions, multiple correlation lengths may appear. The largest correlation lengths often monotonically increase with temperature and diverge in the high temperature limit. Notwithstanding, the magnitude of the correlations themselves decreases with increasing temperature. We examine correlation function in the presence of competing interactions of long and short ranges. The behavior of the correlation and modulation lengths as a function of temperature provides us with selection rules on the possible underlying microscopic interactions. As a concrete example of these notions, we consider the correlations in a system of screened Coulomb interactions coexisting with attractive short range interactions.