Finite-temperature behavior of the Bose polaron

Abstract

We consider a mobile impurity immersed in a Bose gas at finite temperature. Using perturbation theory valid for weak coupling between the impurity and the bosons, we derive analytical results for the energy and damping of the impurity for low and high temperatures, as well as for temperatures close to the critical temperature $T_c$ for Bose-Einstein condensation. These results show that the properties of the impurity vary strongly with temperature. In particular, the energy exhibits a non-monotonic behavior close to $T_c$, and the damping rises sharply close to $T_c$. We argue that this behaviour is generic for impurities immersed in an environment undergoing a phase transition that breaks a continuous symmetry. Finally, we discuss how these effects can be detected experimentally.

10 pages and 6 figures

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Cited by in corpus (22)

• Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
• Universal aspects of a strongly interacting impurity in a dilute Bose condensate
• Fate of the Bose polaron at finite temperature
• Quantum dynamics of Bose-polaron in a $d$-dimensional Bose Einstein condensate
• Quench Dynamics of the Ideal Bose Polaron at Zero and Nonzero Temperatures
• Renormalization group study of Bose polarons
• Pump Probe Spectroscopy of Bose Polarons: Dynamical Formation and Coherence
• Polarons and bipolarons in a two-dimensional square lattice
• Interactions mediated by atoms, photons, electrons, and excitons
• Breathing modes of repulsive polarons in Bose-Bose mixtures
• Medium-induced Interaction Between Impurities in a Bose-Einstein Condensate
• Fermi polaron in low-density spin-polarized neutron matter
• Impurity in a three-dimensional unitary Bose gas
• Dynamics of polaron formation in 1D Bose gases in the strong-coupling regime
• Weakly-interacting Bose-Bose mixtures from the functional renormalisation group
• Bose polaron in spherically symmetric trap potentials: Ground states with zero and lower angular momenta
• Polaritons for testing the universality of an impurity in a Bose-Einstein condensate
• Quantum Cherenkov transition of finite momentum Bose polarons
• Functional renormalisation group approach to the finite-temperature Bose polaron
• Polaronic dressing of bound states
• Quasiparticle nature of the Bose polaron at finite temperature
• Optical response of the supersolid polaron