Theory of the rotating polaron: Spectrum and self-localization

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 de...

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Bibliographic Details
Published in:Physical review. B 2018-12, Vol.98 (22), p.224506, Article 224506
Main Authors: Yakaboylu, Enderalp, Midya, Bikashkali, Deuchert, Andreas, Leopold, Nikolai, Lemeshko, Mikhail
Format: Article
Language:English
Subjects:
Coupling
Degrees of freedom
Fluids
Helium
Localization
Polarons
Rotation
Superfluidity
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.224506