Open AccessStrong nonlinear coupling between an ultracold atomic ensemble and a nanomechanical oscillator
Author(s) -
Gang Chen,
Yongping Zhang,
Xiao Liu,
J.-Q. Liang,
Suotang Jia
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.023016
Subject(s) - quasiparticle , physics , ultracold atom , coupling (piping) , excited state , nonlinear system , atomic physics , phonon , coupling strength , condensed matter physics , quantum mechanics , materials science , quantum , superconductivity , metallurgy
A new type of collective nonlinear coupling is presented via the indirect interaction between an ultracold atomic ensemble and a nanomechanical oscillator. More intriguingly, its interaction strength is enhanced largely with a factor of the atomic number, and thus, reaches a strong coupling regime within current experimental parameters. For the large atomic number, this obtained nonlinear coupling describes the interaction between the phonon and a pair of quasiparticle. Physically, this pair of quasiparticle is excited from the ultracold atomic ensemble when a phonon is emitted and vice versa. Based on these collective excitations, the nonlinear optical processes with the χ(2) term are simulated successfully.