Spin polarization of half-quantum vortex in systems with equal spin pairing

Abstract

We present a variational analysis for a half-quantum vortex (HQV) in the equal-spin-pairing superfluid state which, under suitable conditions, is believed to be realized in Sr2RuO4 and 3He-A. Our approach is based on a description of the HQV in terms of a BCS-like wave function with a spin-dependent boost. We predict a novel feature: the HQV, if stable, should be accompanied by a non-zero spin polarization. Such a spin polarization would exist in addition to the one induced by the Zeeman coupling to the external field and hence may serve as an indicator in experimental search for HQV.

4 pages

References in corpus (2)

• Stability of half quantum vortex in rotating superfluid 3He-A between parallel plates
• Magnetic field induced rotation of the d-vector in Sr_2RuO_4

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