Anomalous Interlayer Hall Effect in Multilayer Massless Dirac Fermion System at the Quantum Limit

摘要

Magnetotransport features, particularly interlayer Hall effect, have been discussed in multilayer massless Dirac fermion systems, in which two-dimensional layers having Dirac-cone dispersion are stacked with weak interlayer coupling. At the quantum limit, where only the n=0 Landau level is partially occupied, the conductivity tensor has been evaluated by the lowest order contribution of interlayer coupling. In addition to in-plane transport behaviors, we have obtained the remarkable interlayer Hall effect which exhibits no dependence on field strength but anomalous dependence on field orientation. These results have successfully explained mysterious transport features observed in a zerogap organic conductor, α-(BEDT-TTF)_2I_3.