Angular momentum in interacting many-body systems hides in phantom vortices
arXiv:1409.7670
Abstract
Vortices are essential to angular momentum in quantum systems such as ultracold atomic gases. The existence of quantized vorticity in bosonic systems stimulated the development of the Gross-Pitaevskii mean-field approximation. However, the true dynamics of angular momentum in finite, interacting many-body systems like trapped Bose-Einstein condensates is enriched by the emergence of quantum correlations whose description demands more elaborate methods. Herein we theoretically investigate the full many-body dynamics of the acquisition of angular momentum by a gas of ultracold bosons in two dimensions using a standard rotation procedure. We demonstrate the existence of a novel mode of quantized vorticity, which we term the that, contrary to the conventional mean-field vortex, can be detected as a topological defect of spatial coherence, but of the density. We describe previously unknown many-body mechanisms of vortex nucleation and show that angular momentum is hidden in phantom vortex modes which so far seem to have evaded experimental detection.
20 pages, 4 figures, Supplementary Information of 14 pages, 1 figure, and 3 videos. http://youtu.be/ezbdLWvSbBI http://youtu.be/whRL8haF4RA http://youtu.be/gG7dprvRWGg
References in corpus (17)
- Non-equilibrium coherence dynamics in one-dimensional Bose gases
- Quantised Vortices in an Exciton-Polariton Fluid
- Spontaneous vortices in the formation of Bose-Einstein condensates
- The multi-configurational time-dependent Hartree method for bosons: Many-body dynamics of bosonic systems
- Fragmentation of Bose-Einstein Condensates
- Role of excited states in the splitting dynamics of interacting Bose-Einstein condensates when ramping-up a barrier
- Reduced density matrices and coherence of trapped interacting bosons
- General variational many-body theory with complete self-consistency for trapped bosonic systems
- Exact quantum dynamics of bosons with finite-range time-dependent interactions of harmonic type
- Fragmented many-body ground states for scalar bosons in a single trap
- Best mean-field for condensates
- How does an interacting many-body system tunnel through a potential barrier to open space?
- Two trapped particles interacting by a finite-ranged two-body potential in two spatial dimensions
- Revealing single-trap condensate fragmentation by measuring density-density correlations after time of flight
- Generic regimes of quantum many-body dynamics of trapped bosonic systems with strong repulsive interactions
- Fragmentation of Spin-orbit Coupled Spinor Bose-Einstein Condensates
- The attractive Bose gas in two dimensions: an analytical study of its fragmentation and collapse
Cited by in corpus (4)
- The multiconfigurational time-dependent Hartree for fermions: Implementation, exactness and application to few-fermion tunneling to open space
- Single shot simulations of dynamic quantum many-body systems
- The uncertainty product of an out-of-equilibrium many-particle system
- Many-body processes in black and grey matter-wave solitons