Abstract
The interlayer magnetoresistance in a multilayered massless Dirac fermion system, $\ensuremath{\alpha}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}{\text{I}}_{3}$, under hydrostatic pressure was investigated. We succeeded in detecting the zero-mode $(n=0)$ Landau level and its spin splitting in the magnetic field normal to the two-dimensional plane. We demonstrated that the effective Coulomb interaction in the magnetic field intensifies the spin splitting of zero-mode Landau carriers. At temperatures below 2 K, magnetic fields above several Tesla break the twofold valley degeneracy.
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