Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session N01: Poster Session II (4:00-6:00pm, EDT)
4:00 PM,
Wednesday, June 1, 2022
Room: Grand Ballroom C
Abstract: N01.00128 : Nonadiabatic decay of metastable states on coupled linear potentials*
Presenter:
Ansh N Shah
(University of Michigan)
Authors:
Ansh N Shah
(University of Michigan)
Alisher Duspayev
(University of Michigan)
Georg A Raithel
(University of Michigan)
Metastable quantum states can form in potential wells emerging from diabatic potentials with opposite slopes and a constant coupling. We investigate nonadiabatic decay of these metastable states on avoided crossings (MSACs) using diabatic and adiabatic representations arising from using Born-Huang theory. Problems of this type arise in various systems in atomic and molecular physics. Examples include atom trapping with RF dressed potentials, formation of Rydberg molecules, etc. We compute the lifetimes of MSACs using 6 different non-perturbative quantum methods, all of which give results that agree well with each other. Time-dependent perturbation theory yields approximate lifetimes that deviate by 30% or less from the non-perturbative results. Lifetime predictions using a semi-classical Landau-Zener model are found to be off by up to a factor of twenty.
*The work was supported by the NSF Grant No. PHY2110049 and in part through computational resources and services provided by Advanced Research Computing at the University of Michigan, Ann Arbor.
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