Electronic Correlations Among the Dirac Electrons in α-(BEDT-TTF)2I3 Unveiled by High-Pressure Optical Spectroscopy
Abstract
The charge-ordered insulator α-(BEDT-TTF)2I3 gradually evolves to a metal when pressure is applied, and at low temperatures the electronic bands form tilted Dirac-like cones. A metallic state with a frequency-independent optical conductivity indicates the coexistence of the trivial and massless Dirac electrons in the system. Our infrared investigations also reveal that at the boundary between insulating and metallic states an energy gap opens due to correlated massive Dirac fermions, which is gradually suppressed when pressure increases.
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