Abstract
A zero-gap state with a Dirac cone type energy dispersion was discovered in an organic conductor α-(BEDT-TTF)2I3 under high hydrostatic pressures. This is the first two-dimensional (2D) zero-gap state discovered in bulk crystals with a layered structure. In contrast to the case of graphene, the Dirac cone in this system is highly anisotropic. The present system, therefore, provides a new type of massless Dirac fermion system with anisotropic Fermi velocity. This system exhibits remarkable transport phenomena characteristic to electrons on the Dirac cone type energy structure.
Highlights
Since Novoselov et al [1] and Zhang et al [2] experimentally demonstrated that graphene is a zero-gap system with massless Dirac particles, such systems have fascinated physicists as a source of exotic systems and/or new physics
The organic conductor α-(BEDT-TTF)2I3 is a member of the (BEDT-TTF)2I3 family [10]
Performed an energy band calculation in 2004 based on the crystal structure analysis of α-(BEDT-TTF)2I3 under uniaxial strain by Kondo and Kagoshima [23] and suggested that this material under high pressures is in the zero-gap state [3,4]
Summary
Since Novoselov et al [1] and Zhang et al [2] experimentally demonstrated that graphene is a zero-gap system with massless Dirac particles, such systems have fascinated physicists as a source of exotic systems and/or new physics. Performed an energy band calculation in 2004 based on the crystal structure analysis of α-(BEDT-TTF)2I3 under uniaxial strain by Kondo and Kagoshima [23] and suggested that this material under high pressures is in the zero-gap state [3,4]. According to their calculations, the bottom of the conduction band and the top of the valence band are in contact with each other at two points (we call these “Dirac points”) in the first Brillouin zone.
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