Temperature dependence of the paramagnetic spin susceptibility of doped graphene

TL;DR

This paper derives a semi-analytical expression for the temperature dependence of spin susceptibility in doped graphene, revealing a $T^{-2}$ behavior at low temperatures, which differs from undoped graphene.

Contribution

It provides a novel semi-analytical formula for the spin-resolved response function of doped graphene, enabling precise predictions of its thermodynamic magnetic properties.

Findings

Spin susceptibility in doped graphene scales as T^{-2} at low temperatures.

The behavior differs significantly from undoped graphene's magnetic response.

The results enhance understanding of thermodynamic properties of doped Dirac materials.

Abstract

In this work, we present a semi-analytical expression for the temperature dependence of a spin-resolved dynamical density-density response function of massless Dirac fermions within the Random Phase Approximation. This result is crucial in order to describe thermodynamic properties of the interacting systems. In particular, we use it to make quantitative predictions for the paramagnetic spin susceptibility of doped graphene sheets. We find that, at low temperatures, the spin susceptibility behaves like $T^{-2}$ which is completely different from the temperature dependence of the magnetic susceptibility in undoped graphene sheets.