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We theoretically investigate the interlayer magnetoresistance inquasi-two-dimensional Dirac fermion systems, where the Fermi energy is at theDirac point. If there is an intermediate insulating layer that has an overlapwith the wave functions in the Dirac fermion layers, there appears a positivemagnetoresistance regime due to the intervalley tunneling. We show that theinterlayer magnetoresistance can be used to find whether Dirac fermions aremassive or not from the minimum in the interlayer magnetoresistance. As aspecific system, we consider \alphaI under high pressure. We also discuss thatone has to be careful in analyzing the crossover temperature from the positiveto negative magnetoresistance. A simple picture is applied to the crossover inthe zero temperature limit but it does not apply to the data at finitetemperatures. We show that the ratio of the Fermi velocity to the scatteringrate is evaluated from the zero temperature limit of the crossover temperature.

journal of the physical society of japan

Intervalley Tunneling and Crossover from the Positive to Negative  Interlayer Magnetoresistance in Quasi-Two-Dimensional Dirac Fermion System  with or without Mass Gap