Quasiparticle approach to molecules interacting with quantum solvents Journal Article

Author(s): Lemeshko, Mikhail
Article Title: Quasiparticle approach to molecules interacting with quantum solvents
Affiliation IST Austria
Abstract: Understanding the behavior of molecules interacting with superfluid helium represents a formidable challenge and, in general, requires approaches relying on large-scale numerical simulations. Here we demonstrate that experimental data collected over the last 20 years provide evidence that molecules immersed in superfluid helium form recently-predicted angulon quasiparticles [Phys. Rev. Lett. 114, 203001 (2015)]. Most importantly, casting the many-body problem in terms of angulons amounts to a drastic simplification and yields effective molecular moments of inertia as straightforward analytic solutions of a simple microscopic Hamiltonian. The outcome of the angulon theory is in good agreement with experiment for a broad range of molecular impurities, from heavy to medium-mass to light species. These results pave the way to understanding molecular rotation in liquid and crystalline phases in terms of the angulon quasiparticle.
Keywords: Quantum gases; Atomic Physics; Mesoscale and Nanoscale Physics; Chemical Physics; Atomic and Molecular Clusters
Journal Title: Physical Review Letters
Volume: 118
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2017-02-27
Start Page: Article number: 095301
DOI: 10.1103/PhysRevLett.118.095301
Notes: We thank Gary Douberly and Bretislav Friedrich for insightful discussions and Robert Zillich for sharing unpublished numerical results [88]. This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915.
Open access: yes (repository)