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Electric-field–induced lifting of the valley degeneracy in α-(BEDT-TTF)2I3 Dirac-like Landau levels

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Published 19 March 2009 Europhysics Letters Association
, , Citation M. O. Goerbig et al 2009 EPL 85 57005



The relativistic Landau levels in the layered organic material α-(BEDT-TTF)2I3 (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene) are sensitive to the tilt of the Dirac cones, which, as in the case of graphene, determine the low-energy electronic properties under appropriate pressure. We show that an applied in-plane electric field, which happens to be in competition with the tilt of the cones, lifts the twofold valley degeneracy due to a different level spacing. This scenario may be tested in infrared transmission spectroscopy.

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