Heating and Cooling in Adiabatic Mixing process

TL;DR

This paper investigates how interactions influence temperature changes during adiabatic mixing of Fermi gases, revealing conditions under which the system can be cooled or heated based on interaction strength and initial temperature.

Contribution

It introduces a real-space BdG approach to analyze temperature dynamics in adiabatic mixing, highlighting the interplay of expansion and interactions in cooling or heating.

Findings

Adiabatic mixing can lead to cooling or heating depending on interaction strength.

Temperature changes differ between bulk and trapped systems.

Interaction effects are crucial in controlling thermal behavior during mixing.

Abstract

We study the effect of interaction on the temperature change in the process of adiabatic mixing two components of fermi gases by the real-space Bogoliubov-de Gennes (BdG) method. We find that in the process of adiabatic mixing, the competition of the adiabatic expansion and the attractive interaction make it possible to cool or heal the system depending on strength of interactions and the initial temperature. The change of temperature in a bulk system and a trapped system have been investigated respectively.