11 October 2022 Tue 4 pm

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Exact propagating topological excitations associated with Z2 symmetry are found in the easy-plane phase of ferromagnetic spin-1 Bose-Einstein condensates, manifesting themselves as kinks in the transverse magnetization.  Propagation is only possible when the symmetry-breaking longitudinal magnetic field is applied. Ferrodark solitons have two types: a low energy branch with positive inertial mass and a higher energy branch with negative inertial mass. Both types become identical at the maximum speed, a new speed bound that is different from speed limits set by the Bogoliubov excitations. The physical mass, which accounts for the number density dip, is negative for both types. In a finite one-dimensional system subject to a linear potential, the soliton undergoes oscillations caused by transitions between the two types occurring at the maximum speed.  

References:

[1] Xiaoquan Yu and P.B. Blakie, Dark soliton-like magnetic domain walls in a two-dimensional ferromagnetic superfluid, Phys. Rev. Research 3, 023043,(2021)

[2] Xiaoquan Yu and P. B. Blakie, Propagating Ferrodark Solitons in a Superfluid: Exact Solutions and Anomalous Dynamics, Phys. Rev. Lett. 128, 125301,(2022)

[3]Xiaoquan Yu and P. B. Blakie, Core structure of static ferrodark solitons in a spin-1 Bose-Einstein condensate, Phys. Rev. Research 4, 033056, (2022)

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