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. Moreover, the Dirac cones are highly tilted in a k-space. This system, thus, provides a testing ground for the investigation of physical phenomena in the multilayered, massless Dirac electron system with anisotropic Fermi velocity. Recently, the carrier injection into this system has been succeeded. Thus, the investigations in this system have expanded. The recent developments are remarkable. This effect exhibits peculiar (quantum) transport phenomena characteristic of electrons on the Dirac cone type energy structure.
Highlights
The realization of the graphene opened the physics of the Dirac electron in a solid [1,2]
We have discovered the zero-gap material with Dirac-type energy dispersion in α-(BEDT-TTF)2 I3 (BEDT-TTF = bis(ethylenedithio) tetrathiafulvalene) [17] (Figure 1) at high pressure
This is the first bulk 2D zero-gap system with Dirac electrons. This material has led the studies of the specific heat [18] and the nuclear magnetic resonance (NMR) [19] for the Dirac electron system
Summary
The realization of the graphene opened the physics of the Dirac electron in a solid [1,2]. We have discovered the zero-gap material with Dirac-type energy dispersion in α-(BEDT-TTF) I3. (BEDT-TTF = bis(ethylenedithio) tetrathiafulvalene) [17] (Figure 1) at high pressure This is the first bulk (multilayered) 2D zero-gap system with Dirac electrons. Another significant feature is that the Dirac cones are highly tilted as shown in Figure 1d,e [13,14,15,16] This system has led to the peculiar transport characteristic of the electrons on the Dirac cone type energy structure [8,9,10,11,12,16,20,21,22,23]. The crystals consist of conductive a member of insulating the (BEDT-TTF)
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