Images and nonlocal vortex pinning in thin superfluid films

Details Images and nonlocal vortex pinning in thin superfluid films Images and nonlocal vortex pinning in thin superfluid films

1998-02-20

arxiv.org/abs/cond-mat/9802217v1

Physics

Condensed Matter

Statistical Mechanics

19 pages, revtex, to appear Phys. Rev. B

Scientific paper

10.1103/PhysRevB.57.7892

For thin films of superfluid adsorbed on a disordered substrate, we derive the equation of motion for a vortex in the presence of a random potential within a mean field (Hartree) description of the condensate. The compressible nature of the condensate leads to an effective pinning potential experienced by the vortex which is nonlocal, with a long range tail that smoothes out the random potential coupling the condensate to the substrate. We interpret this nonlocality in terms of images, and relate the effective potential governing the dynamics to the pinning energy arising from the expectation value of the Hamiltonian with respect to the vortex wavefunction.

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