Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866914767360229376 |
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| author | Spierings, David C. Thywissen, Joseph H. Steinberg, Aephraim M. |
| author_facet | Spierings, David C. Thywissen, Joseph H. Steinberg, Aephraim M. |
| contents | We observe spin rotations caused by atomic collisions in a non-equilibrium Bose-condensed gas of $^{87}$Rb. Reflection from a pseudomagnetic barrier creates counterflow in which forward- and backward-propagating matter waves have partly transverse spin directions. Even though inter-atomic interaction strengths are state-independent, the indistinguishability of parallel spins leads to spin dynamics. A local magnetodynamic model, which captures the salient features of the observed spin textures, highlights an essential connection between four-wave mixing and collisional spin rotation. The observed phenomenon has previously been thought to exist only in nondegenerate gases; our observations and model clarify the nature of these effective-magnetic spin rotations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16069 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions Spierings, David C. Thywissen, Joseph H. Steinberg, Aephraim M. Quantum Gases Quantum Physics We observe spin rotations caused by atomic collisions in a non-equilibrium Bose-condensed gas of $^{87}$Rb. Reflection from a pseudomagnetic barrier creates counterflow in which forward- and backward-propagating matter waves have partly transverse spin directions. Even though inter-atomic interaction strengths are state-independent, the indistinguishability of parallel spins leads to spin dynamics. A local magnetodynamic model, which captures the salient features of the observed spin textures, highlights an essential connection between four-wave mixing and collisional spin rotation. The observed phenomenon has previously been thought to exist only in nondegenerate gases; our observations and model clarify the nature of these effective-magnetic spin rotations. |
| title | Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions |
| topic | Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2308.16069 |