Dynamical formation of polarons in a Bose-Einstein condensate: A variational approach
| Autor: | Ardila, L. A. Peña |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 103, 033323 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.103.033323 |
| Popis: | We investigate the non-equilibrium dynamics of an impurity coupled to a Bose-Einstein condensate, systematically compared with recent experimental results [M. G. Skou et al., Nat. Phys. (2021)]. The dynamics of the impurity is tracked down by using a time-dependent variational coherent ansatz. For weak coupling between the impurity and the bath, analytical expressions for the time-dependent overlap (or contrast) are derived, matching quite well with previous findings obtained within a master equation approach. For strong coupling instead, the variational ansatz provides a good quantitative description of the polaron dynamics, in particular, in signaling the transition from the few to the many-body correlated regime where polarons are expected to form. Comment: 9 pages, 4 figures |
| Databáze: | arXiv |
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