Ring-exchange periodic Anderson model for 3He bilayers

TL;DR

This paper models the 3He bilayer system using a ring-exchange periodic Anderson model, revealing insights into the interplay of dynamics, phase transitions, and magnetic correlations that align with experimental observations.

Contribution

It introduces a novel model incorporating ring exchange in the periodic Anderson framework to explain 3He bilayer phenomena.

Findings

Suppression of coherence temperature near solidification point

Emergence of strong ferromagnetic correlations in the first layer

Evidence for a first-order transition and phase separation

Abstract

We present numerical results of a model calculation for the 3He bilayer system, which captures the interplay between fast and slow dynamics of the different layers and incorporates an independent scale for the three body ring exchange. By means of Cluster-DMFT+CTQMC, we find remarkable similarities with the experiments: a suppression of the coherence temperature upon approaching the solidification point of the first layer accompanied by the onset of strong ferromagnetic correlations within the first layer. Based on the consistent results for different cluster sizes we conjecture a first-order transition cutting short the Kondo breakdown, which allows us to interpret the experimental observation of an intervening phase preempting the quantum critical point in terms of a phase separation.