▎ 摘　　要

Strong electron interactions can lead to a variety of broken-symmetry phases in monolayer graphene. In the quantum Hall regime, the interaction effect are enhanced by the formation of highly degenerate Landau levels, catalyzing the emergence of such phases. Recent magnetotransport studies show evidence that the nu = 0 quantum Hall state of graphene is in an insulating canted antiferromagnetic phase with the Neel vector lying within the graphene plane. Here, we show that this Neel order can be detected via two-terminal spin transport. We find that a dynamic and inhomogeneous texture of the Neel vector can mediate nearly dissipationless (superfluid) transport of spin angular momentum polarized along the z axis, which could serve as a strong support for the antiferromagnetic scenario. The injection and detection of spin current in the nu = 0 region can be achieved using the two spin-polarized edge channels of the vertical bar nu vertical bar = 2 quantum Hall state. Measurements of the dependence of the spin current on the length of the nu = 0 region would provide direct evidence for spin superfluidity.