vortex in superfluidity is well known(adsbygoogle = window.adsbygoogle || []).push({});

in a continuum system, a vortex is well defined

along a closed (continuous) path, the phase change is well defined.

However, on a lattice, i donot think the phase change from site to site can be well defined.

but people are talking about vortex in a josephson junction array.

Could anyone explain this to me?

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# How can one define vortex on a lattice

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