Hiroki Isobe, Naoto Nagaosa
The quasi-two-dimensional organic semiconductor \alpha-(BEDT-TTF)2I3 has an anisotropic linear dispersion with the zero energy gap near the Fermi level. Due to the vanishing density of states at the Fermi level, the Coulomb interaction is unscreened in this material. We study theoretically the effect of the long-range Coulomb interaction and the low energy/long-wavelength behavior of \alpha-(BEDT-TTF)2I3 using the renormalization group analysis. The nearly logarithmic enhancement of the velocity reshapes the tilted Dirac cones, and changes the low temperature behavior. We also show the theoretical calculation for the site-selective spin susceptibility, which can be measured by an NMR experiment.
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http://arxiv.org/abs/1207.6818
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