Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3

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dc.creatorGoerbig, M. O.
dc.creatorFuchs, J. -N.
dc.creatorMontambaux, G.
dc.creatorPiechon, F.
dc.date2008-03-06
dc.date2008-06-20
dc.date.accessioned2026-07-07T09:49:58Z
dc.date.available2026-07-07T09:49:58Z
dc.descriptionWe investigate a generalized two-dimensional Weyl Hamiltonian, which may describe the low-energy properties of mechanically deformed graphene and of the organic compound alpha-(BEDT-TTF)_2I_3 under pressure. The associated dispersion has generically the form of tilted anisotropic Dirac cones. The tilt arises due to next-nearest-neighbor hopping when the Dirac points, where the valence band touches the conduction band, do not coincide with crystallographic high-symmetry points within the first Brillouin zone. Within a semiclassical treatment, we describe the formation of Landau levels in a strong magnetic field, the relativistic form of which is reminiscent to that of graphene, with a renormalized Fermi velocity due to the tilt of the Dirac cones. These relativistic Landau levels, experimentally accessible via spectroscopy or even a quantum Hall effect measurement, may be used as a direct experimental verification of Dirac cones in alpha-(BEDT-TTF)_2I_3.
dc.description11 pages, 5 figures; version accepted for publication in PRB, contains a more detailed discussion of the zero-energy Landau level in the presence of the tilt, technical parts shifted to the appendix
dc.identifierhttps://arxiv.org/abs/0803.0912
dc.identifierhttp://arxiv.org/abs/0803.0912
dc.identifierPhys. Rev. B 78, 045415 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.045415
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/164787
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleTilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
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