Dynamics of elliptical vortices in a trapped quantum fluid
| Autor: | Mark T. Lusk, Chuanzhou Zhu, Mark E. Siemens |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Quantum fluid Computer simulation Non-equilibrium thermodynamics FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Vortex Nonlinear system Classical mechanics Quantum Gases (cond-mat.quant-gas) Orientation (geometry) Condensed Matter::Superconductivity 0103 physical sciences Precession Condensed Matter - Quantum Gases 010306 general physics Trajectory (fluid mechanics) |
| DOI: | 10.48550/arxiv.2102.10193 |
| Popis: | The nonequilibrium dynamics of vortices in 2D quantum fluids can be predicted by accounting for the way in which vortex ellipticity is coupled to the gradient in background fluid density. In the absence of nonlinear interactions, a harmonically trapped fluid can be analyzed analytically to show that single vortices will move in an elliptic trajectory that has the same orientation and aspect ratio as the vortex projection itself. This allows the vortex ellipticity to be estimated through observation of its trajectory. A combination of analysis and numerical simulation is then used to show that nonlinear interactions cause the vortex orientation to precess, and that the rate of vortex precession is once again mimicked by a precession of the elliptical trajectory. Both vortex ellipticity and rate of precession can therefore be inferred by observing its motion in a trap. An ability to anticipate and control local vortex structure and vortex trajectory is expected to prove useful in designing few-vortex systems in which ellipticity is a ubiquitous, as-yet-unharnessed feature. Comment: 10 figures; Comments are welcome |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|