Effects of the Zero-Mode Landau Level on Inter-Layer Magnetoresistance in Multilayer Massless Dirac Fermion Systems

TL;DR

This study experimentally investigates how the zero-mode Landau level influences interlayer magnetoresistance in multilayer Dirac fermion systems, revealing the presence and effects of zero-mode Landau carriers under magnetic fields.

Contribution

First experimental detection of zero-mode Landau level effects on interlayer magnetoresistance in multilayer Dirac fermion systems under pressure.

Findings

Zero-mode Landau level detected at contact points of Dirac cones.

Characteristic features of zero-mode Landau carriers observed.

Zeeman effect influences interlayer magnetoresistance.

Abstract

We report on the experimental results of interlayer magnetoresistance in multilayer massless Dirac fermion system $\alpha$-(BEDT-TTF)$_2$I$_3$ under hydrostatic pressure and its interpretation. We succeeded in detecting the zero-mode Landau level (n=0 Landau level) that is epected to appear at the contact points of Dirac cones in the magnetic field normal to the two-dimensional plane. The characteristic feature of zero-mode Landau carriers including the Zeeman effect is clearly seen in the interlayer magnetoresistance.