Macroscopic Quantum Tunneling Escape of Bose-Einstein Condensates
| Autor: | Xinxin Zhao, Kenji Maeda, Diego A. Alcala, Lincoln D. Carr, Ramon Ramos, Shreyas Potnis, Marie A. McLain, Aephraim M. Steinberg |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Condensed matter physics Condensed Matter::Other FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas law.invention Quantum Gases (cond-mat.quant-gas) law Quantum mechanics 0103 physical sciences High Energy Physics::Experiment Physics::Chemical Physics 010306 general physics Condensed Matter - Quantum Gases Bose–Einstein condensate Quantum tunnelling |
| Popis: | Recent experiments on macroscopic quantum tunneling reveal a non-exponential decay of the number of atoms trapped in a quasibound state behind a potential barrier. Through both experiment and theory, we demonstrate this non-exponential decay results from interactions between atoms. Quantum tunneling of tens of thousands of 87 Rb atoms in a Bose-Einstein condensate is modeled by a modified Jeffreys-Wentzel-Kramers-Brillouin model, taking into account the effective time-dependent barrier induced by the mean-field. Three-dimensional Gross-Pitaevskii simulations corroborate a mean-field result when compared with experiments. However, with one-dimensional modeling using time-evolving block decimation, we present an effective renormalized mean-field theory that suggests many-body dynamics for which a bare mean-field theory may not apply. |
| Databáze: | OpenAIRE |
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