Pomeranchuk Cooling in Frustrated Magnets -- a Route to Spin Liquids in Cold Atoms

Shintaro Taie, Rekishu Yamazaki, Seiji Sugawa +1 more

Kazuki Uematsu

B. Wolf, A. Honecker, Walter Hofstetter +2 more

This article reviews some recent developments for new cooling technologies in the fields of condensed matter physics and cold gases, both from an experimental and theoretical point of view. The main idea is to make use of distinct many-body interactions of the system to be cooled which can be some cooling stage or the material of interest itself, as is the case in ultracold gases. For condensed matter systems, we discuss magnetic cooling schemes based on a large magnetocaloric effect as a result of a nearby quantum phase transition and consider effects of geometrical frustration. For ultracold gases, we review many-body cooling techniques, such as spin-gradient and Pomeranchuk cooling, which can be applied in the presence of an optical lattice. We compare the cooling performance of these new techniques with that of conventional approaches and discuss state-of-the-art applications.

Frédéric Mila

Félix Werner, Olivier Parcollet, Antoine Georges +1 more

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 localization, an analogue of the Pomeranchuk effect in liquid helium 3. We discuss its application to the experimental realization of the antiferromagnetic phase. We illustrate our arguments with dynamical mean-field theory calculations.

C. Lhuillier, Grégoire Misguich