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• W3105761750 abstract "We give a detailed account of a stationary impurity in an ideal Bose-Einstein condensate, which we call the ideal Bose polaron, at both zero and nonzero temperatures and arbitrary strength of the impurity-boson coupling. The time evolution is solved exactly and it is found that, surprisingly, many of the features that have been predicted for the real BEC are already present in this simpler setting and can be understood analytically therein. We obtain explicit formulas for the time evolution of the condensate wave function at $T=0$ and of the one-particle density matrix at $T>0$. For negative scattering length, the system is found to thermalize even though the dynamics are perfectly coherent. The time evolution and thermal values of the Tan contact are derived and compared to a recent experiment. We find that contrary to the Fermi polaron, the contact is not bounded at unitarity as long as a condensate exists. An explicit formula for the dynamical overlap at $T=0$ allows us to compute the rf spectrum which can be understood in detail by relating it to the two-body problem of one boson and the impurity." @default.
• W3105761750 created "2020-11-23" @default.
• W3105761750 creator A5057173690 @default.
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• W3105761750 date "2021-03-19" @default.
• W3105761750 modified "2023-10-11" @default.
• W3105761750 title "Quench Dynamics of the Ideal Bose Polaron at Zero and Nonzero Temperatures" @default.
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• W3105761750 doi "https://doi.org/10.1103/physreva.103.033317" @default.
• W3105761750 hasPublicationYear "2021" @default.
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