De Haas-van Alphen effect and a giant temperature peak in heavy fermion SmB$_6$ compound

TL;DR

This paper proposes a theoretical explanation for the giant temperature peak in de Haas-van Alphen oscillations in insulating SmB$_6$, attributing it to a heavy-fermion hybrid with potential edge states.

Contribution

It introduces a model of two hybridizing fermions with different masses to explain the observed phenomena in SmB$_6$.

Findings

Heavy-fermion hybrid causes the temperature peak.

Hybridization opens a gap at degeneracy point.

Scenario of edge states in the hybrid.

Abstract

In this paper we suggest a possible explanation of the giant temperature peak in the amplitude of the de Haas-van Alphen oscillations observed at very low temperatures in insulating SmB$_6$ system. Our theoretical model consists of two fermions with particle-like dispersion but with different masses, one much heavier than the other, which hybridize with each other to open up a gap at their degeneracy point. As a result of the hybridization a heavy-fermion hybrid appears at the Fermi level. Our results strongly suggest that it is exactly this heavy-fermion hybrid which results in the giant temperature peak. In addition we propose a scenario when this hybrid has edge states.