Libration of strongly oriented polar molecules inside a superfluid Journal Article

Author(s): Redchenko, Elena; Lemeshko, Mikhail
Article Title: Libration of strongly oriented polar molecules inside a superfluid
Affiliation IST Austria
Abstract: We study a polar molecule immersed in a superfluid environment, such as a helium nanodroplet or a Bose–Einstein condensate, in the presence of a strong electrostatic field. We show that coupling of the molecular pendular motion, induced by the field, to the fluctuating bath leads to formation of pendulons—spherical harmonic librators dressed by a field of many-particle excitations. We study the behavior of the pendulon in a broad range of molecule–bath and molecule–field interaction strengths, and reveal that its spectrum features a series of instabilities which are absent in the field-free case of the angulon quasiparticle. Furthermore, we show that an external field allows to fine-tune the positions of these instabilities in the molecular rotational spectrum. This opens the door to detailed experimental studies of redistribution of orbital angular momentum in many-particle systems. © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Keywords: cold molecules; Stark effect; angulon; helium nanodroplets; impurity problem
Journal Title: ChemPhysChem
Volume: 17
Issue 22
ISSN: 1439-7641
Publisher: Wiley-Blackwell  
Date Published: 2016-01-01
Start Page: 3649
End Page: 3654
DOI: 10.1002/cphc.201601042
Open access: yes (repository)
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