Thermodynamic properties of tunneling quasiparticles in graphene-based structures

TL;DR

This paper investigates the thermodynamic behavior of quasiparticles in a layered graphene structure with superconducting and normal layers, revealing a universal low-temperature specific heat behavior independent of external parameters.

Contribution

It introduces a theoretical model for quasiparticle thermodynamics in layered graphene structures, predicting universal low-temperature specific heat behavior.

Findings

Specific heat exhibits -T^3 behavior at low temperatures

Universal behavior independent of gate voltage and superconducting gap

Provides a theoretical foundation for understanding massless quasiparticle matter

Abstract

Thermodynamic properties of quasiparticles in a graphene-based structures are investigated. Two graphene superconducting layers (one superconducting component is placed on the top layeredgraphene structure and the other component in the bottom) separated by oxide dielectric layers and one normal graphene layer in the middle. The quasiparticle flow emerged due to external gate voltage, we considered it as a gas of electron-hole pairs whose components belong to different layers. This is a striking result in view of the complexity of these systems: we have established that specific heat exhibits universal (-T3) behaviour at low T, independent from the gate voltage and the superconducting gap. The experimental observation of this theoretical prediction would be an important step towards our understanding of critical massless matter.