Interaction-induced adiabatic cooling and antiferromagnetism of cold fermions in optical lattices

TL;DR

This paper proposes a novel cooling method for cold fermions in optical lattices based on increasing spin entropy, facilitating the experimental realization of antiferromagnetic phases, supported by theoretical calculations.

Contribution

It introduces an interaction-induced cooling mechanism analogous to the Pomeranchuk effect, advancing the control of quantum phases in cold atom systems.

Findings

The proposed cooling mechanism increases spin entropy upon localization.

Dynamical Mean-Field Theory supports the feasibility of the method.

Potential pathway to experimentally realize antiferromagnetic order in optical lattices.

Abstract

We propose an interaction-induced cooling mechanism for two-component cold fermions in an optical lattice. It is based on an increase of the ``spin'' entropy upon localisation, an analogue of the Pomeranchuk effect in liquid Helium 3. We discuss its application to the experimental realisation of the antiferromagnetic phase. We illustrate our arguments with Dynamical Mean-Field Theory calculations.