Rotational cooling of molecules in a Bose-Einstein condensate
Will M, Lausch T, Fleischhauer M (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 99
Article Number: 062707
Journal Issue: 6
DOI: 10.1103/PhysRevA.99.062707
Abstract
We discuss the rotational cooling of diatomic molecules in a Bose-Einstein condensate (BEC) of ultracold atoms by emission of phonons with orbital angular momentum. Despite the superfluidity of the BEC there is no frictionless rotation for typical molecules since the dominant cooling occurs via emission of particle-like phonons. Only for macrodimers, whose size becomes comparable to or larger than the condensate healing length, a Landau-like, critical angular momentum exists below which phonon emission is suppressed. We find that the rotational relaxation of typical molecules is, in general, faster than the cooling of the linear motion of impurities in a BEC. This also leads to a finite lifetime of angulons, quasiparticles of rotating molecules coupled to phonons with orbital angular-momentum. We analyze the dynamics of rotational cooling for homonuclear diatomic molecules based on a quantum Boltzmann equation including single- and two-phonon scattering and discuss the effect of thermal phonons.
Involved external institutions
Germany (DE)How to cite
APA:
Will, M., Lausch, T., & Fleischhauer, M. (2019). Rotational cooling of molecules in a Bose-Einstein condensate. Physical Review A, 99(6). https://dx.doi.org/10.1103/PhysRevA.99.062707
MLA:
Will, Martin, Tobias Lausch, and Michael Fleischhauer. "Rotational cooling of molecules in a Bose-Einstein condensate." Physical Review A 99.6 (2019).
BibTeX: Download