On the survival of the quantum depletion of a condensate after release from a magnetic trap
Abstract We present observations of the high momentum tail in expanding Bose–Einstein condensates of metastable Helium atoms released from a harmonic trap. The far-field density profile exhibits features that support identification of the tails of the momentum distribution as originating in the in-s...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-16477-9 |
| _version_ | 1817968043386470400 |
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| author | J. A. Ross P. Deuar D. K. Shin K. F. Thomas B. M. Henson S. S. Hodgman A. G. Truscott |
| author_facet | J. A. Ross P. Deuar D. K. Shin K. F. Thomas B. M. Henson S. S. Hodgman A. G. Truscott |
| author_sort | J. A. Ross |
| collection | DOAJ |
| description | Abstract We present observations of the high momentum tail in expanding Bose–Einstein condensates of metastable Helium atoms released from a harmonic trap. The far-field density profile exhibits features that support identification of the tails of the momentum distribution as originating in the in-situ quantum depletion prior to release. Thus, we corroborate recent observations of slowly-decaying tails in the far-field beyond the thermal component. This observation is in conflict with the hydrodynamic theory, which predicts that the in-situ depletion does not survive when atoms are released from a trap. Indeed, the depleted tails even appear stronger in the far-field than expected before release, and we discuss the challenges of interpreting this in terms of the Tan contact in the trapped gas. In complement to these observations, full quantum simulations of the experiment show that, under the right conditions, the depletion can persist into the far field after expansion. Moreover, the simulations provide mechanisms for survival and for the the large-momentum tails to appear stronger after expansion due to an acceleration of the depleted atoms by the mean-field potential. However, while in qualitative agreement, the final depletion observed in the experiment is much larger than in the simulation. |
| first_indexed | 2024-04-13T20:03:47Z |
| format | Article |
| id | doaj.art-3abc28bbc34d441da8b83e1a11a10be0 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-13T20:03:47Z |
| publishDate | 2022-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-3abc28bbc34d441da8b83e1a11a10be02022-12-22T02:32:07ZengNature PortfolioScientific Reports2045-23222022-08-0112111510.1038/s41598-022-16477-9On the survival of the quantum depletion of a condensate after release from a magnetic trapJ. A. Ross0P. Deuar1D. K. Shin2K. F. Thomas3B. M. Henson4S. S. Hodgman5A. G. Truscott6Research School of Physics, Australian National UniversityInstitute of Physics, Polish Academy of SciencesResearch School of Physics, Australian National UniversityResearch School of Physics, Australian National UniversityResearch School of Physics, Australian National UniversityResearch School of Physics, Australian National UniversityResearch School of Physics, Australian National UniversityAbstract We present observations of the high momentum tail in expanding Bose–Einstein condensates of metastable Helium atoms released from a harmonic trap. The far-field density profile exhibits features that support identification of the tails of the momentum distribution as originating in the in-situ quantum depletion prior to release. Thus, we corroborate recent observations of slowly-decaying tails in the far-field beyond the thermal component. This observation is in conflict with the hydrodynamic theory, which predicts that the in-situ depletion does not survive when atoms are released from a trap. Indeed, the depleted tails even appear stronger in the far-field than expected before release, and we discuss the challenges of interpreting this in terms of the Tan contact in the trapped gas. In complement to these observations, full quantum simulations of the experiment show that, under the right conditions, the depletion can persist into the far field after expansion. Moreover, the simulations provide mechanisms for survival and for the the large-momentum tails to appear stronger after expansion due to an acceleration of the depleted atoms by the mean-field potential. However, while in qualitative agreement, the final depletion observed in the experiment is much larger than in the simulation.https://doi.org/10.1038/s41598-022-16477-9 |
| spellingShingle | J. A. Ross P. Deuar D. K. Shin K. F. Thomas B. M. Henson S. S. Hodgman A. G. Truscott On the survival of the quantum depletion of a condensate after release from a magnetic trap Scientific Reports |
| title | On the survival of the quantum depletion of a condensate after release from a magnetic trap |
| title_full | On the survival of the quantum depletion of a condensate after release from a magnetic trap |
| title_fullStr | On the survival of the quantum depletion of a condensate after release from a magnetic trap |
| title_full_unstemmed | On the survival of the quantum depletion of a condensate after release from a magnetic trap |
| title_short | On the survival of the quantum depletion of a condensate after release from a magnetic trap |
| title_sort | on the survival of the quantum depletion of a condensate after release from a magnetic trap |
| url | https://doi.org/10.1038/s41598-022-16477-9 |
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