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arXiv · 1506.01061

Spin Superfluidity in the $ν=0$ Quantum Hall State of Graphene

So Takei·Amir Yacoby·Bertrand I. Halperin·Yaroslav Tserkovnyak
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Abstract

A proposal to detect the purported canted antiferromagnet order for the $ν=0$ 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 $z$ 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 $|ν|=2$ quantum Hall state on two opposite ends of the $ν=0$ 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.

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So Takei, Amir Yacoby, Bertrand I. Halperin, Yaroslav Tserkovnyak. 2015-06-02. Spin Superfluidity in the $ν=0$ Quantum Hall State of Graphene. https://doi.org/10.1103/physrevlett.116.216801

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