Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities
| Title: | Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities |
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| Authors: | Cayla, Hugo, Massignan, Pietro, Giamarchi, Thierry, Aspect, Alain, Westbrook, Christoph I., Clément, David |
| Source: | Phys. Rev. Lett. 130, 153401 (2023) |
| Publication Year: | 2022 |
| Collection: | Condensed Matter Physics (Other) |
| Subject Terms: | Condensed Matter - Quantum Gases, Physics - Atomic Physics |
| More Details: | We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate and in the impurity cloud. These algebraic tails originate from the impurity-BEC interaction, but their amplitudes greatly exceed those expected from two-body contact interactions at equilibrium in the trap. Furthermore, in the absence of impurities, such algebraic tails are not found in the BEC density measured after the interaction-driven expansion. These results highlight the key role played by impurities when present, a possibility that had not been considered in our previous work [Phys. Rev. Lett. 117, 235303 (2016)]. Our measurements suggest that these unexpected algebraic tails originate from the non-trivial dynamics of the expansion in the presence of impurity-bath interactions. Comment: 6 pages, 6 figures |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevLett.130.153401 |
| Access URL: | http://arxiv.org/abs/2204.10697 |
| Accession Number: | edsarx.2204.10697 |
| Database: | arXiv |
| DOI: | 10.1103/PhysRevLett.130.153401 |
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