Generalized Adiabatic Impulse Approximation

Abstract

Non-adiabatic transitions in multilevel systems appear in various fields of physics, but it is not easy to analyze their dynamics in general. In this paper, we propose to extend the adiabatic impulse approximation to multilevel systems. This approximation method is shown to be equivalent to a series of unitary evolutions and facilitates to evaluate the dynamics numerically. In particular, we analyze the dynamics of the Landau-Zener grid model and the multilevel Landau-Zener-Stückelberg-Majorana interference model, and confirm that the results are in good agreement with the exact dynamics evaluated numerically. We also derive the conditions for destructive interference to occur in the multilevel system.

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• Majorana's approach to nonadiabatic transitions validates the adiabatic-impulse approximation
• Coherent reaction between molecular and atomic Bose-Einstein condensates: integrable model
• Exact WKB analysis for adiabatic discrete-level Hamiltonians
• Cascaded-mode interferometers: spectral shape and linewidth engineering
• Effect of decay of the final states on the probabilities of the Landau-Zener transitions in multistate non-integrable models
• A spectrum-based shortcut method for topological systems