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Nondissipative force acting on a vortex in Fermi superfluids andsuperconductors is calculated from the spectral flow of fermion zero modes inthe vortex core. The spectral flow effect casts a new light on the problem ofmutual friction in superfluids. We demonstrate that, for vortices in anisotropic system, the reactive mutual friction parameter D'(T) is negative inthe collisionless regime and it is positive in the hydrodynamic regime. Thisagrees with 3He-B measurements [1] ( T.D.C. Bevan, et al, Phys. Rev. Lett., 74,750 (1995)), which thus give the experimental verification of the spectral floweffect in the vortex dynamics. General expression for all 3 nondissipativeforces (Magnus, Iordanskii and spectral flow) is presented in the wholetemperature range.

Spectral Flow in Vortex Dynamics of 3 He-B and Superconductors

Spectral Flow in Vortex Dynamics of ³ He-B and Superconductors