  Quantum systems often exhibit fundamental incapability to entertain vortex.
The Meissner effect, a complete expulsion of the magnetic field (the
electromagnetic vorticity), for instance, is taken to be the defining attribute
of the superconducting state. Superfluidity is another, close-parallel example;
fluid vorticity can reside only on topological defects with a limited
(quantized) amount. Recent developments in the Bose-Einstein condensates
produced by particle traps further emphasize this characteristic. We show that
the challenge of imparting vorticity to a quantum fluid can be met through a
nonlinear mechanism operating in a hot fluid corresponding to a thermally
modified Pauli-Schroedinger spinor field. In a simple field-free model, we show
that the thermal effect, represented by a nonlinear, non-Hermitian Hamiltonian,
in conjunction with spin vorticity, leads to new interesting quantum states; a
spiral solution is explicitly worked out.
