Critical Energy Dissipation in a Binary Superfluid Gas by a Moving Magnetic Obstacle

Abstract

We study the critical energy dissipation in an atomic superfluid gas with two symmetric spin components by an oscillating magnetic obstacle. Above a certain critical oscillation frequency, spin-wave excitations are generated by the magnetic obstacle, demonstrating the spin superfluid behavior of the system. When the obstacle is strong enough to cause density perturbations via local saturation of spin polarization, half-quantum vortices (HQVs) are created for higher oscillation frequencies, which reveals the characteristic evolution of critical dissipative dynamics from spin-wave emission to HQV shedding. Critical HQV shedding is further investigated using a pulsed linear motion of the obstacle, and we identify two critical velocities to create HQVs with different core magnetization.

8 pages, 7 figures

References in corpus (6)

• Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier
• Superfluid behaviour of a two-dimensional Bose gas
• The critical velocity in the BEC-BCS crossover
• Critical spin superflow in a spinor Bose-Einstein condensate
• Properties of a nematic spin vortex in an antiferromagnetic spin-1 Bose-Einstein condensate
• Spin and mass currents near a moving magnetic obstacle in a two-component Bose-Einstein condensate

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• Detection of roton and phonon excitations in a spin-orbit coupled Bose-Einstein condensate with a moving barrier
• The cross-over from Townes solitons to droplets in a 2D Bose mixture
• Half-quantum vortex generation in a two-component Bose-Einstein condensate by an oscillatory magnetic obstacle
• Hydrodynamic generation of skyrmions in a two-component Bose-Einstein condensate
• Fractional vortex array realized at twin boundary in a nematic superconductor
• Vortex shedding patterns in holographic superfluids at finite temperature
• Critical speed of a binary superfluid of light
• Emergent aperiodicity in Bose-Bose mixtures induced by spin-dependent periodic potentials