Activation gap in the specific heat measurements for He${}^3$ bi-layers

Abstract

Recently, attention has been given to a system of He${}^3$ bi-layers where a quantum criticality similar to the one in heavy fermion compounds has been observed [Science 317, 1356 92007)] In our previous analysis [Phys. Rev. B 79, 045112 (2007)], based on the Kondo breakdown scenario, we addressed successfully most of the features observed in that experiment. Here, we consider the activation energy $\Delta$ observed experimentally in the specific heat measurements at low temperatures in the heavy Fermi liquid phase. Within our previous study of this system, this is identified with the gap opening when the upper hybridized band is emptied due to a strong hybridization between the nearly localized first layer and the fluid second one. We discuss the successes and limitations of our approach. An additional prediction is proposed.

arXiv comment6 pages, 6 figures - replaced with the published version

References in corpus (13)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Locally critical quantum phase transitions in strongly correlated metals
• How do Fermi liquids get heavy and die?
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Spin Liquid in the Multiple-Spin Exchange model on the Triangular lattice: 3He on graphite
• Kondo Breakdown and Hybridization Fluctuations in the Kondo-Heisenberg Lattice
• Local fluctuations in quantum critical metals
• Kondo Breakdown as a Selective Mott Transition in the Anderson Lattice
• Selective Mott transition and heavy fermions
• Multi-scale fluctuations near a Kondo Breakdown Quantum Critical Point
• The effective mass of two--dimensional 3He
• Model of Quantum Criticality in He3 bilayers Adsorbed on graphite
• He3 bi-layers as a simple example of de-confinement

Cited by in corpus (2)

• Quantum critical Mott transitions in a bilayer Kondo insulator-metal model system
• Ring-exchange periodic Anderson model for 3He bilayers