AC Oscillation of a Spin Soliton Driven by a Constant Force

Abstract

The phenomena of AC oscillation generated by a DC drive, such as the famous Josephson AC effect in superconductors and Bloch oscillation in solid physics, are of great interest in physics. Here we report another example of such counter-intuitive phenomenon that a spin soliton in a two-component Bose-Einstein condensate is driven by a constant force: The initially static spin soliton first moves in a direction opposite to the force and then changes direction, showing an extraordinary AC oscillation in a long term. In sharp contrast to the Josephson AC effect and Bloch oscillation, we find that the nonlinear interactions play important roles and the spin soliton can exhibit a periodic transition between negative and positive inertial mass even in the absence of periodic potentials. We then develop an explicit quasiparticle model that can account for this extraordinary oscillation satisfactorily. Important implications and possible applications of our finding are discussed.

arXiv comment9 pages, 6 figures

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Cited by in corpus (12)

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• Propagating Ferrodark Solitons in a Superfluid: Exact Solutions and Anomalous Dynamics
• Controlled engineering of a vortex-bright soliton dynamics using a constant driving force
• Bloch Oscillations of a Soliton in a 1D Quantum Fluid
• Classification of Dark Solitons via Topological Vector Potentials
• Systematic vector solitary waves from their linear limits in one-dimensional $n$-component Bose-Einstein condensates
• Systematic solitary waves from their linear limits in two-component Bose-Einstein condensates with unequal dispersion coefficients
• Dispersion engineering in spin-orbit coupled spinor $F=1$ condensates driven by negative masses
• Self-Adapted Josephson Oscillation of Dark-Bright Solitons under Constant Forces
• Motion of ferrodark solitons in trapped superfluids: spin corrections and emergent oscillators
• Magnetic soliton molecules in binary condensates