Manifestation of superfluidity in atom-number-imbalanced two-component Bose-Einstein condensates
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917709737885696 |
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| author | Al-Marzoug, S. M. Baizakov, B. B. Khawaja, U. Al Bahlouli, H. |
| author_facet | Al-Marzoug, S. M. Baizakov, B. B. Khawaja, U. Al Bahlouli, H. |
| contents | Superfluid and dissipative regimes in the dynamics of a two-component quasi-one-dimensional Bose-Einstein condensate (BEC) with unequal atom numbers in the components have been explored. The system supports localized waves of the symbiotic type owing to the same-species repulsion and cross-species attraction. The minority BEC component moves through the majority component and creates excitations. To quantify the emerging excitations we introduce a time-dependent function called disturbance. Through numerical simulations of the coupled Gross-Pitaevskii equations with periodic boundary conditions, we have revealed a critical velocity of the localized wave, above which a transition from superfluid to dissipative regime occurs, evidenced by a sharp increase in the disturbance function. The factors responsible for the discrepancy between the actual critical velocity and the speed of sound, expected from theoretical arguments, have been discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_07204 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Manifestation of superfluidity in atom-number-imbalanced two-component Bose-Einstein condensates Al-Marzoug, S. M. Baizakov, B. B. Khawaja, U. Al Bahlouli, H. Quantum Gases Superfluid and dissipative regimes in the dynamics of a two-component quasi-one-dimensional Bose-Einstein condensate (BEC) with unequal atom numbers in the components have been explored. The system supports localized waves of the symbiotic type owing to the same-species repulsion and cross-species attraction. The minority BEC component moves through the majority component and creates excitations. To quantify the emerging excitations we introduce a time-dependent function called disturbance. Through numerical simulations of the coupled Gross-Pitaevskii equations with periodic boundary conditions, we have revealed a critical velocity of the localized wave, above which a transition from superfluid to dissipative regime occurs, evidenced by a sharp increase in the disturbance function. The factors responsible for the discrepancy between the actual critical velocity and the speed of sound, expected from theoretical arguments, have been discussed. |
| title | Manifestation of superfluidity in atom-number-imbalanced two-component Bose-Einstein condensates |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2406.07204 |