Phase Transition in Small System

TL;DR

This paper reviews the phenomenon of negative specific heat observed in small systems during phase transitions, highlighting how microscopic behaviors differ from bulk properties and exploring recent experimental and theoretical insights.

Contribution

It provides a comprehensive review of the negative specific heat phenomenon in small systems, connecting experimental findings with theoretical explanations.

Findings

Negative specific heat occurs in small systems during phase transitions.

Small systems can cool while being heated, contrary to bulk behavior.

Recent studies reveal microscopic origins of this anomaly.

Abstract

Everybody knows that when a liquid is heated, its temperature increases until the moment when it starts to boil. The increase in temperature then stops, all heat being used to transform the liquid into vapor. What is the microscopic origin of such a strange behavior? Does a liquid drop containing only few molecules behave the same? Recent experimental and theoretical developments seem to indicate that at the elementary level of very small systems, this anomaly appears in an even more astonishing way: during the change of state - for example from liquid to gas - the system cools whereas it is heated, i.e. its temperature decreases while its energy increases. This paper presents a review of our understanding of the negative specific heat phenomenon.