Evolution of density variations in a trapped atomic superfluid driven into turbulence
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912614231048192 |
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| author | Moreno-Armijos, Michelle A. Machado, Leandro García-Orozco, Arnol D. Sab, Sarah Fritsch, Amilson R. Bagnato, Vanderlei S. |
| author_facet | Moreno-Armijos, Michelle A. Machado, Leandro García-Orozco, Arnol D. Sab, Sarah Fritsch, Amilson R. Bagnato, Vanderlei S. |
| contents | In this work, we study the free decay of a turbulent trapped Bose gas by analyzing the temporal evolution of density variations extracted from absorption images. We introduce a parameter $δ$ as a simple and experimentally accessible observable that captures the amplitude of density variations. After the driving is turned off, this parameter exhibits a clear decay, which enabled us to identify a characteristic relaxation time. Interestingly, this timescale remains nearly constant across the range of excitation amplitudes explored, while the magnitude of $δ$ varies with the injected energy. Numerical simulations based on the Gross-Pitaevskii equation reveal a qualitatively similar behavior, both showing a decay of density variations over time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_20206 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evolution of density variations in a trapped atomic superfluid driven into turbulence Moreno-Armijos, Michelle A. Machado, Leandro García-Orozco, Arnol D. Sab, Sarah Fritsch, Amilson R. Bagnato, Vanderlei S. Quantum Gases In this work, we study the free decay of a turbulent trapped Bose gas by analyzing the temporal evolution of density variations extracted from absorption images. We introduce a parameter $δ$ as a simple and experimentally accessible observable that captures the amplitude of density variations. After the driving is turned off, this parameter exhibits a clear decay, which enabled us to identify a characteristic relaxation time. Interestingly, this timescale remains nearly constant across the range of excitation amplitudes explored, while the magnitude of $δ$ varies with the injected energy. Numerical simulations based on the Gross-Pitaevskii equation reveal a qualitatively similar behavior, both showing a decay of density variations over time. |
| title | Evolution of density variations in a trapped atomic superfluid driven into turbulence |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2504.20206 |