Volume 85, Number 5, March 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 March 2009|
Electric-field–induced lifting of the valley degeneracy in α-(BEDT-TTF)2I3 Dirac-like Landau levels
Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud - F-91405 Orsay Cedex, France, EU
Corresponding author: email@example.com
Accepted: 13 February 2009
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.
PACS: 73.61.Wp – Fullerenes and related materials / 73.61.Ph – Polymers; organic compounds / 73.43.-f – Quantum Hall effects
© EPLA, 2009
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