Theory of the Rotating Polaron: Spectrum and Self-Localization

Abstract

We study a quantum impurity possessing both translational and internal rotational degrees of freedom interacting with a bosonic bath. Such a system corresponds to a `rotating polaron', which can be used to model, e.g., a rotating molecule immersed in an ultracold Bose gas or superfluid Helium. We derive the Hamiltonian of the rotating polaron and study its spectrum in the weak- and strong-coupling regimes using a combination of variational, diagrammatic, and mean-field approaches. We reveal how the coupling between linear and angular momenta affects stable quasiparticle states, and demonstrate that internal rotation leads to an enhanced self-localization in the translational degrees of freedom.

arXiv comment11 pages, 6 figures

References in corpus (35)

• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Quantum dynamics of a single, mobile spin impurity
• Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
• Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
• Attractive and repulsive Fermi polarons in two dimensions
• Bose polarons in the strongly interacting regime
• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Spectroscopy and dynamics in helium nanodroplets
• Ultrafast many-body interferometry of impurities coupled to a Fermi sea
• Field-theoretical study of the Bose polaron
• Suppression and enhancement of impurity scattering in a Bose-Einstein condensate
• Quantum transport through a Tonks-Girardeau gas
• Dynamics of single neutral impurity atoms immersed in an ultracold gas
• Quantum dynamics of ultracold Bose polarons
• Quasiparticle properties of a mobile impurity in a Bose-Einstein condensate
• Creation of Rydberg Polarons in a Bose Gas
• Variational study of polarons in Bose-Einstein condensates
• Rotation of quantum impurities in the presence of a many-body environment
• Decoherence of Impurities in a Fermi Sea of Ultracold Atoms
• Motional Coherence of Fermions Immersed in a Bose Gas
• Bose polarons in ultracold atoms in one dimension: beyond the Fröhlich paradigm
• Renormalization group approach to the Fröhlich polaron model: application to impurity-BEC problem
• Strong coupling Bose polarons in a BEC
• Quasiparticle approach to molecules interacting with quantum solvents
• Laser-induced rotation of iodine molecules in He-nanodroplets: revivals and breaking-free
• Deformation of a quantum many-particle system by a rotating impurity
• Emergence of non-abelian magnetic monopoles in a quantum impurity problem
• Rotation of cold molecular ions inside a Bose-Einstein condensate
• The p-wave polaron
• Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules
• Diagrammatic Monte Carlo approach to angular momentum in quantum many-particle systems
• Anomalous screening of quantum impurities by a neutral environment
• Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment
• Angular self-localization of impurities rotating in a bosonic bath
• Molecular impurities interacting with a many-particle environment: from helium droplets to ultracold gases

Cited by in corpus (9)

• Bose polaron in spherical trap potentials: Spatial structure and quantum depletion
• Molecular Impurities as a Realization of Anyons on the Two-Sphere
• Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon
• Intermolecular forces and correlations mediated by a phonon bath
• Bose polaron in spherically symmetric trap potentials: Ground states with zero and lower angular momenta
• Disorder in order: Localization without randomness in a cold atom system
• Microscopic theory of Raman scattering for the rotational organic cation in metal halide perovskites
• Synthetic spin-orbit coupling mediated by a bosonic environment
• Self-localization of magnons and magnetoroton in a binary Bose-Einstein condensate