Rotation of cold molecular ions inside a Bose-Einstein condensate Journal Article

Author(s): Midya, Bikashkali; Tomza, Michał; Schmidt, Richard T; Lemeshko, Mikhail P
Article Title: Rotation of cold molecular ions inside a Bose-Einstein condensate
Affiliation IST Austria
Abstract: We use recently developed angulon theory [R. Schmidt and M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.203001] to study the rotational spectrum of a cyanide molecular anion immersed into Bose-Einstein condensates of rubidium and strontium. Based on ab initio potential energy surfaces, we provide a detailed study of the rotational Lamb shift and many-body-induced fine structure which arise due to dressing of molecular rotation by a field of phonon excitations. We demonstrate that the magnitude of these effects is large enough in order to be observed in modern experiments on cold molecular ions. Furthermore, we introduce a novel method to construct pseudopotentials starting from the ab initio potential energy surfaces, which provides a means to obtain effective coupling constants for low-energy polaron models.
Keywords: statistical mechanics; molecular dynamics; Molecular physics; Quantum chemistry; Bose-Einstein condensates; Ion sources; Potential energy; Potential energy surfaces; Stereochemistry; Temperature measurement; Ab initio potential energy surface; Effective coupling; Molecular anions; Molecular rotations; Phonon excitations; Pseudopotentials; Rotational spectra
Journal Title: Physical Review A - Atomic, Molecular, and Optical Physics
Volume: 94
Issue 4
ISSN: 1094-1622
Publisher: American Physical Society  
Date Published: 2016-10-13
Start Page: Article number: 041601
DOI: 10.1103/PhysRevA.94.041601
Notes: The work was supported by the NSF through a grant for the Institute for Theoretical Atomic, Molecular, and Optical Physics at Harvard University and the Smithsonian Astrophysical Observatory. B.M. acknowledges financial support received from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement No. 291734. M.T. acknowledges support from the EU Marie Curie COFUND action (ICFOnest), the EU Grants ERC AdG OSYRIS, FP7 SIQS and EQuaM, FETPROACT QUIC, the Spanish Ministry Grants FOQUS (FIS2013-46768-P) and Severo Ochoa (SEV-2015-0522), Generalitat de Catalunya (SGR 874), Fundacio Cellex, the National Science Centre (2015/19/D/ST4/02173), and the PL-Grid Infrastructure.
Open access: yes (repository)
IST Austria Authors
  1. Bikashkali Midya
    4 Midya
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