AQP Seminar: Effects of magnetic field on vortex states in superfluid 3He-B

Aalto Quantum Physics Seminar (Nanotalo). Speaker: Prof. Mikio Nakahara (Shanghai University)

Superfluid 3He-B possesses three locally stable vortices known as a
normal-core vortex (o-vortex), an A-phase-core vortex (v-vortex), and a
double-core vortex (d-vortex). In this work, we study the effects of a
magnetic field parallel or perpendicular to the vortex axis on these
structures by solving the two-dimensional Ginzburg-Landau equation for two
different sets of strong coupling correction. The energies of the v- and
d-vortices have nontrivial dependence on the magnetic field. As a
longitudinal magnetic field increases, the v-vortex is energetically
unstable even for high pressures and the d-vortex becomes energetically
most stable for all possible ranges of pressure. For a transverse magnetic
field the energy of the v-vortex becomes lower than that of the d-vortex
in the high pressure region. In addition, the orientation of the double
cores in the d-vortex prefers to be parallel to the magnetic field at low
pressures, while the d-vortex with the double cores perpendicular to the
magnetic field is allowed to continuously deform into the v-vortex by
increasing the pressure.


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