Bose polarons at finite temperature and strong coupling
arXiv:1708.08861 · doi:10.1103/PhysRevLett.120.050405
Abstract
The temperature dependence of a mobile impurity in a dilute Bose gas, the Bose polaron, is investigated for wide a range of impurity-bath interactions. Using a diagrammatic resummation scheme designed to include scattering processes important at finite temperature , we show that the phase transition of the environment to a Bose-Einstein condensate at the critical temperature leads to several non-trivial effects. The attractive polaron present at fragments into two quasiparticle states for finite temperature whenever , with and the impurity-boson and boson-boson scattering lengths. While the quasiparticle with higher energy disappears at , the ground state quasiparticle remains well-defined across . Its energy depends non-monotonically on temperature, featuring a minimum at , after which it increases towards zero, and at the polaron eventually becomes overdamped due to strong scattering with thermally excited bosons.
4 pages, 5 figures
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