Temporal shaping and time varying orbital angular momentum of displaced vortices
arXiv:2006.07173 · doi:10.1364/OPTICA.397046
Abstract
The fundamental mode of rotation in quantum fluids is given by a vortex, whose quantized value yields the orbital angular momentum (OAM) per particle. If the vortex is displaced (off-centered) from the reference point for rotation, the angular momentum is reduced and becomes fractional. Such displaced vortices can further exhibit a peculiar dynamics in presence of confining potentials or couplings to other fields. We study analytically a number of 2D systems where displaced vortices exhibit a noteworthy dynamics, including time-varying self-sustained oscillation of the OAM, complex reshaping of their morphology with possible creation of vortex-antivortex pairs and peculiar trajectories for the vortex core with sequences of strong accelerations and decelerations which can even send the core to infinity and bring it back. Interestingly, these do not have to occur conjointly, with complex time dynamics of the vortex core and/or their wavepacket morphology possibly taking place without affecting the total OAM. Our results generalize to simple and fundamental systems a phenomenology recently reported with Rabi-coupled bosonic fields, showing their wider relevance and opening prospects for new types of control and structuring of the angular momentum of light and/or quantum fluids.
arXiv comment13 pages, 6 figures
References in corpus (21)
- Vortices in a Bose-Einstein Condensate
- Quantised Vortices in an Exciton-Polariton Fluid
- Observation of Half Quantum Vortices in an Exciton-Polariton Condensate
- Persistent currents and quantised vortices in a polariton superfluid
- Light with a self-torque: extreme-ultraviolet beams with time-varying orbital angular momentum
- Single vortex-antivortex pair in an exciton polariton condensate
- Dynamics of Few Co-rotating Vortices in Bose-Einstein Condensates
- Vortex and half-vortex dynamics in a spinor quantum fluid of interacting polaritons
- Interactions and scattering of quantum vortices in a polariton fluid
- Vortex dynamics in spin-orbit coupled Bose-Einstein condensates
- Detuning-controlled internal oscillations in an exciton-polariton condensate
- Self-interfering wavepackets
- Persistent circular currents of exciton-polaritons in cylindrical pillar microcavities
- Rotating superfluids in anharmonic traps: From vortex lattices to giant vortices
- Polaritonic Rabi and Josephson Oscillations
- Excitation of exciton-polariton vortices in pillar microcavities by a Gaussian beam
- Rotating patterns in polariton condensates in ring-shaped potentials under bichromatic pump
- Vortex precession dynamics in general radially symmetric potential traps in two-dimensional atomic Bose-Einstein condensates
- Multistable circular currents of polariton condensates trapped in ring potentials
- Detuning control of Rabi vortex oscillations in light matter coupling
- Polaritonic linear dynamic in Keldysh formalism