Laser cooling of a trapped two-component Fermi gas

TL;DR

This paper presents a quantum master equation and Monte Carlo simulations demonstrating that laser cooling can effectively reduce the temperature of a trapped two-component Fermi gas to very low levels, with minimal background heating effects.

Contribution

The study introduces a quantum master equation approach and numerical analysis for laser cooling of Fermi gases, achieving ultra-low temperatures in the festina lente regime.

Findings

Temperatures of about 0.008 T_F are achievable.

Laser cooling can be maintained with minimal background loss.

Analytic temperature expressions match numerical results.

Abstract

The collective Raman cooling of a trapped two-component Fermi gas is analyzed. We develop the quantum master equation that describes the collisions and the laser cooling, in the festina lente regime, where the heating due to photon reabsorption can be neglected. The numerical results based on Monte Carlo simulations show, that three-dimensional temperatures of the order of 0.008 T_F can be achieved. We analyze the heating related to the background losses, and conclude that our laser-cooling scheme can maintain the temperature of the gas without significant additional losses. Finally we derive an analytic expression for the temperature of a trapped Fermi gas heated by background collisions, that agrees very well with the data obtained from the numerical simulation.