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

摘要

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