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The charge-ordered insulator $\alpha$-(BEDT-TTF)$_2$I$_3$ gradually evolvesto a metal when pressure is applied, and at low temperatures the electronicbands form tilted Dirac-like cones. A metallic state with afrequency-independent optical conductivity indicates the coexistence of thetrivial and massless Dirac electrons in the system. Our infrared investigationsalso reveal that at the boundary between insulating and metallic states anenergy gap opens due to correlated massive Dirac fermions, which is graduallysuppressed when pressure increases.

Electronic Correlations Among the Dirac Electrons in $\alpha$-(BEDT-TTF)$_2$I$_3$ Unveiled by High-Pressure Optical Spectroscopy