Self-induced density modulations in the free expansion of Bose-Einstein condensates
| Autor: | Luca Salasnich, Nicola Manini, Michael Korbman, Federico Bonelli, Alberto Parola |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Condensed Matter::Quantum Gases
Shock wave Quantum fluid Physics Statistical Mechanics (cond-mat.stat-mech) Condensed matter physics FOS: Physical sciences Rarefaction Pattern Formation and Solitons (nlin.PS) Nonlinear Sciences - Pattern Formation and Solitons Atomic and Molecular Physics and Optics law.invention Condensed Matter - Other Condensed Matter Maxima and minima Nonlinear system law Free expansion Maxima Condensed Matter - Statistical Mechanics Bose–Einstein condensate Other Condensed Matter (cond-mat.other) |
| Popis: | We simulate numerically the free expansion of a repulsive Bose-Einstein condensate with an initially Gaussian density profile. We find a self-similar expansion only for weak inter-atomic repulsion. In contrast, for strong repulsion we observe the spontaneous formation of a shock wave at the surface followed by a significant depletion inside the cloud. In the expansion, contrary to the case of a classical viscous gas, the quantum fluid can generate radial rarefaction density waves with several minima and maxima. These intriguing nonlinear effects, never observed yet in free-expansion experiments with ultra-cold alkali-metal atoms, can be detected with the available setups. Comment: 4 pages, 4 figures |
| Databáze: | OpenAIRE |
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