Ferrodark solitons in a spinor superfluid: exact solutions, novel speed limit and anomalous dynamics
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TDLI Meeting Room N600 (East Wing of Floor 6, North Building)
Exact propagating topological solitons 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. Such 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 elementary 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)
He is an assistant professor at Graduate School of China Academy of Engineering Physics (GSCAEP). He obtained his PhD in theoretical physics in 2012 from SISSA and conducted postdoctoral research at New Zealand institute for advanced study and the physics department of the University of Otago. His main research interests focus on out of equilibrium processes in quantum fluids driven by topological defects, including collective dynamics of quanutm vortices, quantum turbulence, and dynamics of magnetic domain walls.
Tencent meeting link: https://meeting.tencent.com/dm/yklp8QKGPIjY Meeting ID: 728 894 170, no password
