Abstract
We investigated the magnetoresistance and the Hall effect in an organic massless Dirac fermion system α-(BETS)2I3 under pressure. The Fermi energy of this system is slightly far away from the Dirac points, and thus the ν = 1 quantum Hall state is realized in a low magnetic field at low temperatures. Moreover, the experimental formula for chemical potential as a function of temperature is clarified. We succeeded in detecting the inter-band effects of the magnetic field on the Hall conductivity when the chemical potential passes the Dirac points.
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