Nonadiabatic decay of metastable states on coupled linear potentials
POSTER
Abstract
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.
Publication: [1] " Nonadiabatic decay of metastable states on coupled linear potentials, "Alisher Duspayev, Ansh Shah, Georg Raithel, arXiv:2201.12388 [quant-ph].
Presenters
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Ansh N Shah
- University of Michigan