Theory of inplane magnetoresistance in two-dimensional massless Dirac fermion system

TL;DR

This paper develops a theoretical model for in-plane magnetoresistance in two-dimensional massless Dirac fermion systems, accounting for Zeeman splitting and electron-electron interactions, and compares it with experimental data.

Contribution

It introduces a comprehensive theory including Zeeman and interaction effects on Landau level broadening in Dirac systems, aligning well with experimental observations.

Findings

Temperature dependence shows a minimum and plateau in magnetoresistance.

Good agreement with experiments on organic conductor -(BEDT-TTF)_2I_3.

Discussion of graphene's in-plane magnetoresistance based on the theory.

Abstract

We present the theory of the inplane magnetoresistance in two-dimensional massless Dirac fermion systems including the Zeeman splitting and the electron-electron interaction effect on the Landau level broadening within a random phase approximation. With the decrease in temperature, we find a characteristic temperature dependence of the inplane magnetoresistance showing a minimum followed by an enhancement with a plateau. The theory is in good agreement with the experiment of the layered organic conductor \alpha-(BEDT-TTF)_2I_3 under pressure. In-plane magnetoresistsnce of graphene is also discussed based on this theory.