Quantum transport thermometry for electrons in graphene

TL;DR

This paper introduces a novel method for measuring electron temperature in graphene devices using conductance fluctuation correlations, effective even under overheating conditions, and demonstrates its experimental feasibility.

Contribution

The paper presents a new thermometry technique based on conductance fluctuation correlations that is insensitive to scattering details in graphene.

Findings

Method accurately measures electron temperature in graphene.

Effective in overheating scenarios where $T_e > T$.

Experimental validation demonstrates practical applicability.

Abstract

We propose a method of measuring the electron temperature $T_e$ in mesoscopic conductors and demonstrate experimentally its applicability to micron-size graphene devices in the linear-response regime ($T_e\approx T$, the bath temperature). The method can be {especially useful} in case of overheating, $T_e>T$. It is based on analysis of the correlation function of mesoscopic conductance fluctuations. Although the fluctuation amplitude strongly depends on the details of electron scattering in graphene, we show that $T_e$ extracted from the correlation function is insensitive to these details.