Spin Superfluidity in the Quantum Hall State of Graphene
arXiv:1506.01061 · doi:10.1103/PhysRevLett.116.216801
Abstract
A proposal to detect the purported canted antiferromagnet order for the quantum Hall state of graphene based on a two-terminal spin transport setup is theoretically discussed. In the presence of a magnetic field normal to the graphene plane, a dynamic and inhomogeneous texture of the Néel vector lying within the plane should mediate (nearly dissipationless) superfluid transport of spin angular momentum polarized along the axis, which could serve as a strong support for the canted antiferromagnet scenario. Spin injection and detection can be achieved by coupling two spin-polarized edge channels of the quantum Hall state on two opposite ends of the region. A simple kinetic theory and Onsager reciprocity are invoked to model the spin injection and detection processes, and the transport of spin through the antiferromagnet is accounted for using the Landau-Lifshitz-Gilbert phenomenology.
5 pages; 5 figures
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