Tilted anisotropic Dirac cones in quinoid-type graphene and α-(BEDT-TTF)2I3

被引：332

作者：

Goerbig, M. O. ^{[1
]}

Fuchs, J. -N. ^{[1
]}

Montambaux, G. ^{[1
]}

Piechon, F. ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, Phys Solides Lab, UMR 8502, F-91405 Orsay, France

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.78.045415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We 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)(2)I-3 [BEDT-TTF=bis(ethylenedithio)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 alpha-(BEDT-TTF)(2)I-3.

引用

页数：10

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