Abstract

The phase diagram detailing mass and spin superfluidity in a two-dimensional easy-plane ferromagnetic Bose gas is obtained. The relevant topological defects driving spin and mass Berezinskii-Kosterlitz-Thouless transitions are identified, and the role of superfluid drag is determined. Evidence is presented for a vortex-plasma phase mimicking the much-sought-after quark-gluon plasma.

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