Theory of a resonantly interacting impurity in a Bose-Einstein condensate

• URL: http://arxiv.org/abs/2003.01982v2
• Date: Mon, 13 Jul 2020 09:30:08 GMT
• Title: Theory of a resonantly interacting impurity in a Bose-Einstein condensate
• Authors: Moritz Drescher, Manfred Salmhofer, Tilman Enss
• Abstract summary: We investigate a Bose-Einstein condensate in strong interaction with a single impurity particle. We find a new dynamical transition regime between attractive and repulsive polarons.
• Score: 0.6445605125467572
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate a Bose-Einstein condensate in strong interaction with a single impurity particle. While this situation has received considerable interest in recent years, the regime of strong coupling remained inaccessible to most approaches due to an instability in Bogoliubov theory arising near the resonance. We present a nonlocal extension of Gross-Pitaevskii theory that is free of such divergences and does not require the use of the Born approximation in any of the interaction potentials. We find a new dynamical transition regime between attractive and repulsive polarons, where an interaction quench results in a finite number of coherent oscillations in the density profiles of the medium and in the contact parameter before equilibrium is reached.

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