Angular self-localization of impurities rotating in a bosonic bath Journal Article

Author(s): Li, Xiang; Seiringer, Robert; Lemeshko, Mikhail
Article Title: Angular self-localization of impurities rotating in a bosonic bath
Affiliation IST Austria
Abstract: The existence of a self-localization transition in the polaron problem has been under an active debate ever since Landau suggested it 83 years ago. Here we reveal the self-localization transition for the rotational analogue of the polaron -- the angulon quasiparticle. We show that, unlike for the polarons, self-localization of angulons occurs at finite impurity-bath coupling already at the mean-field level. The transition is accompanied by the spherical-symmetry breaking of the angulon ground state and a discontinuity in the first derivative of the ground-state energy. Moreover, the type of the symmetry breaking is dictated by the symmetry of the microscopic impurity-bath interaction, which leads to a number of distinct self-localized states. The predicted effects can potentially be addressed in experiments on cold molecules trapped in superfluid helium droplets and ultracold quantum gases, as well as on electronic excitations in solids and Bose-Einstein condensates.
Keywords: Quantum gases; Atomic Physics; Mesoscale and Nanoscale Physics; Chemical Physics; Other Condensed Matter
Journal Title: Physical Review A
Volume: 95
ISSN: 1094-1622
Publisher: American Physical Society  
Date Published: 2017-03-06
Start Page: Aricle number: 033608
DOI: 10.1103/PhysRevA.95.033608
Notes: R.S. acknowledges support by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 694227), and by the Austrian Science Fund (FWF), Project No. P27533-N27. M.L. acknowledges support by the Austrian Science Fund (FWF), Project No. P29902-N27.
Open access: yes (repository)
IST Austria Authors
  1. Robert Seiringer
    120 Seiringer
  2. Xiang Li
    1 Li
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