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We report on the Shubnikov de Haas (SdH) oscillations in the quasitwo-dimensional molecular conductor $\alpha-$(BETS)$_{2}$I$_{3}$ [BETS:bis(ethylenedithio)tetraselenafulvalene] laminated on polyimide films at 1.7 K.From the SdH phase factor, we verified experimentally that the material is inthe Dirac fermion phase under pressure. $\alpha-$(BETS)$_{2}$I$_{3}$ is in thevicinity of the phase transition between strongly correlated insulating andDirac fermion phases, and is a possible candidate for an ambient-pressuremolecular Dirac fermion system. However, the SdH oscillations indicate that theBerry phase is zero at ambient pressure. Under pressure, a $\pi$ Berry phaseemerges when the metal-insulator crossover is almost suppressed at $\sim$0.5GPa. The results contrast those for the pioneering molecular Dirac fermionsystem $\alpha-$(BEDT-TTF)$_{2}$I$_{3}$ [BEDT-TTF:bis(ethylenedithio)tetrathiafulvalene] in which Dirac fermions andsemiconducting behavior are simultaneously observed.

Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $\alpha-$(BETS)$_{2}$I$_{3}$