Magneto-optics of quasirelativistic electrons in graphene with an inplane electric field and in tilted Dirac cones in α-(BEDT TTF)2 I3
2015
Massless Dirac fermions occur as low-energy modes in several quasi-two-dimensional condensed matter
systems such as graphene, the surface of bulk topological insulators, and in layered organic semiconductors.
When the rotational symmetry in such systems is reduced either by an in-plane electric field or an intrinsic tilt
of the Dirac cones, the allowed dipolar optical transitions evolve from a few selected transitions into a wide fan
of interband transitions. We show that the Lorentz covariance of the low-energy carriers allows for a concise
analysis of the emergingmagneto-optical properties. We predict that infrared absorption spectra yield quantitative
information on the tilted Dirac cone structure in organic compounds such as α-(BEDT-TTF)2I3.
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