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We have experimentally confirmed the quantum Hall ferromagnetic state withChern number \nu=0, characterized by the helical edge state, in a layeredorganic Dirac fermion system \alpha-(BEDT-TTF)_2I_3. The interlayer resistancesaturates at low temperatures and high magnetic fields. It does not scale withthe sample cross-sectional area in the saturating region, and resonantlydepends on the magnetic field direction. These results strongly suggest thatthe helical edge state dominates transport. This is the first observation ofthe topological phase in organic molecular crystals.

Experimental Confirmation of Quantum Hall Ferromagnetic State in an Organic Dirac Fermion System