Anomalous Doppler effect in two-component Bose-Einstein condensates
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914201256067072 |
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| author | Zawiślak, Tomasz Stringari, Sandro Recati, Alessio |
| author_facet | Zawiślak, Tomasz Stringari, Sandro Recati, Alessio |
| contents | We show that two-component Bose-Einstein condensed mixtures, in presence of a persistent current, exhibit a non trivial Doppler shift of the sound velocities. The peculiarity is due to the inter-species interaction and the possibility of generating a counter-flow persistent current. Analytic predictions are derived by using superfluid hydrodynamics. While the existence of anomalous Doppler shifts at finite temperature has been discussed a long time ago in the case of superfluid Helium-4, an experimental verification of the effect is still missing. For this reason, we also propose a protocol for the measurement of the Doppler shifts, based on the density-density response function. The dynamical protocol is simulated by means of coupled Gross-Pitaevskii equations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_04398 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous Doppler effect in two-component Bose-Einstein condensates Zawiślak, Tomasz Stringari, Sandro Recati, Alessio Quantum Gases We show that two-component Bose-Einstein condensed mixtures, in presence of a persistent current, exhibit a non trivial Doppler shift of the sound velocities. The peculiarity is due to the inter-species interaction and the possibility of generating a counter-flow persistent current. Analytic predictions are derived by using superfluid hydrodynamics. While the existence of anomalous Doppler shifts at finite temperature has been discussed a long time ago in the case of superfluid Helium-4, an experimental verification of the effect is still missing. For this reason, we also propose a protocol for the measurement of the Doppler shifts, based on the density-density response function. The dynamical protocol is simulated by means of coupled Gross-Pitaevskii equations. |
| title | Anomalous Doppler effect in two-component Bose-Einstein condensates |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2508.04398 |