Angular momentum in interacting many-body systems hides in phantom vortices
| Autor: | Weiner, Storm E., Tsatsos, Marios C., Cederbaum, Lorenz S., Lode, Axel U. J. |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 $\textit{phantom vortex}$ that, contrary to the conventional mean-field vortex, can be detected as a topological defect of spatial coherence, but $\textit{not}$ 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. Comment: 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 |
| Databáze: | arXiv |
| Externí odkaz: |
|