Tilted anisotropic Dirac cones in quinoid-type graphene and α-(BEDT-TTF) 2 I 3
By M. Goerbig, J. Fuchs, G. Montambaux, F. Piéchon. 2008
240 citations recorded by the source corpus.
We investigate a generalized two-dimensional Weyl Hamiltonian, which may describe the low-energy properties of mechanically deformed graphene and of the organic compound $\ensuremath{\alpha}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}{\text{I}}_{3}$ $[\text{BEDT-TTF}=\text{bis}(\text{ethylene}\text{dithio)tetrathiafulvalene}]$ 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 of 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 $\ensuremath{\alpha}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}{\text{I}}_{3}$.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/65ae0190fea131c94668869c5fe890ce4a7e5212
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Citations in the corpus
- Electronic properties of graphene in a strong magnetic field (2010, background): “The hopping t′ along δ3 is then different from that t along δ1 and δ2 (Dietl et al., 2008; Farjam and Rafii-Tabar, 2009; Goerbig et al., 2008; Hasegawa et al., 2006; Wunsch et al., 2008; Zhu et al., 2007), t→ t′ = t+ ∂t ∂a δa.”