Self-stabilized Bose polarons
arXiv:2102.13616 · doi:10.21468/SciPostPhys.13.3.054
Abstract
The mobile impurity in a Bose-Einstein condensate (BEC) is a paradigmatic many-body problem. For weak interaction between the impurity and the BEC, the impurity deforms the BEC only slightly and it is well described within the Fröhlich model and the Bogoliubov approximation. For strong local attraction this standard approach, however, fails to balance the local attraction with the weak repulsion between the BEC particles and predicts an instability where an infinite number of bosons is attracted toward the impurity. Here we present a solution of the Bose polaron problem beyond the Bogoliubov approximation which includes the local repulsion between bosons and thereby stabilizes the Bose polaron even near and beyond the scattering resonance. We show that the Bose polaron energy remains bounded from below across the resonance and the size of the polaron dressing cloud stays finite. Our results demonstrate how the dressing cloud replaces the attractive impurity potential with an effective many-body potential that excludes binding. We find that at resonance, including the effects of boson repulsion, the polaron energy depends universally on the effective range. Moreover, while the impurity contact is strongly peaked at positive scattering length, it remains always finite. Our solution highlights how Bose polarons are self-stabilized by repulsion, providing a mechanism to understand quench dynamics and nonequilibrium time evolution at strong coupling.
arXiv comment10 pages, 5 figures
References in corpus (60)
- Many-Body Physics with Ultracold Gases
- Feshbach Resonances in Ultracold Gases
- Energetics of a strongly correlated Fermi gas
- Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
- Bose polarons in the strongly interacting regime
- Universal phase diagram of a strongly interacting Fermi gas with unbalanced spin populations
- Froehlich Polaron and Bipolaron: Recent Developments
- Quantum dynamics of impurities in a 1D Bose gas
- Motion of a heavy impurity through a Bose-Einstein condensate
- Field-theoretical study of the Bose polaron
- Feynman path-integral treatment of the BEC-impurity polaron
- Small polarons in dilute gas Bose-Einstein condensates
- Bose polarons near quantum criticality
- Impurity in a Bose-Einstein condensate: study of the attractive and repulsive branch using quantum Monte-Carlo methods
- Quantum dynamics of ultracold Bose polarons
- Impurity in a Bose-Einstein condensate and the Efimov effect
- Creation of Rydberg Polarons in a Bose Gas
- Bipolarons in a Bose-Einstein Condensate
- Variational study of polarons in Bose-Einstein condensates
- Non-equilibrium quantum dynamics and formation of the Bose polaron
- Rotation of quantum impurities in the presence of a many-body environment
- Radio frequency spectroscopy of polarons in ultracold Bose gases
- Motional Coherence of Fermions Immersed in a Bose Gas
- A mesoscopic Rydberg impurity in an atomic quantum gas
- Renormalization group approach to the Fröhlich polaron model: application to impurity-BEC problem
- Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
- Strong coupling Bose polarons in a BEC
- Universal three-body parameter in heteronuclear atomic systems
- Efimov physics beyond universality
- Diagrammatic Monte Carlo study of the acoustic and the BEC polaron
- Static properties of positive ions in atomic Bose-Einstein condensates
- Universality of an impurity in a Bose-Einstein condensate
- Two impurities in a Bose-Einstein condensate: from Yukawa to Efimov attracted polarons
- Effective approach to impurity dynamics in one-dimensional trapped Bose gases
- Real-space dynamics of attractive and repulsive polarons in Bose-Einstein condensates
- Theory of excitation of Rydberg polarons in an atomic quantum gas
- Observation of the phononic Lamb shift with a synthetic vacuum
- Quantum Impurity in a One-dimensional Trapped Bose Gas
- Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
- Critical slowdown of non-equilibrium polaron dynamics
- Universal aspects of a strongly interacting impurity in a dilute Bose condensate
- Ionic polaron in a Bose-Einstein condensate
- Fate of the Bose polaron at finite temperature
- Theory of a resonantly interacting impurity in a Bose-Einstein condensate
- Many-body quantum dynamics and induced correlations of Bose polarons
- Strong coupling treatment of the polaronic system consisting of an impurity in a condensate
- Quantum behavior of a heavy impurity strongly coupled to a Bose gas
- Strong-coupling Bose polarons in 1D: Condensate deformation and modified Bogoliubov phonons
- Many-body interferometry of magnetic polaron dynamics
- Dissipative correlated dynamics of a moving impurity immersed in a Bose-Einstein Condensate
- From Efimov Physics to the Bose Polaron using Gaussian States
- Efimov States of Heavy Impurities in a Bose-Einstein Condensate
- Efimov states near a Feshbach resonance and the limits of van der Waals universality at finite background scattering length
- Quench Dynamics of the Ideal Bose Polaron at Zero and Nonzero Temperatures
- Impurity-induced multi-body resonances in a Bose gas
- Scattering of two heavy Fermi polarons: resonances and quasibound states
- Quantum versus mean-field collapse in a many-body system
- Chemistry of a light impurity in a Bose-Einstein condensate
- Trapping Collapse
- Impurity in a three-dimensional unitary Bose gas