Pressure effects on Dirac fermions in {\alpha}-(BEDT-TTF)2I3
  We investigate the pressure effect on the layered Dirac fermion system, which is realized in quasi-two-dimensional organic compound {\alpha}-(BEDT-TTF)2I3. The trajectory of the contact points is investigated using the tight-binding model with the transfer integrals determined by X-ray diffraction experiments. Vanishing of the Dirac fermion spectrum, opening of the gap, and pressure dependence of inter-layer magnetoresistance are discussed. 
Takahiro Himura, Takao Morinari and Takami Tohyama
cond-mat.mes-hall