Abstract
We propose a definition of vorticity at inverse temperature βfor Gibbs states in quantum XY spin systems on the lattice by testing \exp[-βH] on a complete set of observables ("one-point functions"). We show in particular that it is independent of the choice of a particular basis. Imposing a compression of Pauli matrices at the boudary, which stands for the classical environment, we make some numerical simulations on finite lattices, and exhibit usual vortex patterns.
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