Model of Quantum Criticality in He3 bilayers Adsorbed on graphite

TL;DR

This paper models quantum criticality in He3 bilayers on graphite using an Anderson lattice framework, successfully explaining experimental observations like two QCPs and variations in effective mass and coherence temperature.

Contribution

It introduces a novel modeling approach combining Anderson lattice and Coulomb interactions to explain quantum critical phenomena in He3 bilayers.

Findings

Reproduces the occurrence of two quantum critical points.

Explains the variation of effective mass with coverage.

Accounts for changes in coherence temperature.

Abstract

Recent experiments on He3 bilayers adsorbed on Graphite have shown striking quantum critical properties at the point where the first layer localizes. We model this system with the Anderson lattice plus inter-layer Coulomb repulsion in two dimensions. Assuming that quantum critical fluctuations come from a vanishing of the effective hybridization, we can reproduce several features of the system, including the apparent occurrence of two quantum critical points (QCP), the variation of the effective mass and coherence temperature with coverage.