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Europhysics Letters (EPL)

Tunnelling Control in the Driven SU (2) N -Body System

P. Kamiński, Marek Płoszajczak, Robert Arvieu

Published Apr 1, 1994• 2 citations
Publisher

Abstract

Quantum tunnelling is investigated using an exactly soluble, periodically driven Lipkin N -body model. Coherent suppression of the tunnelling is found for specific parameters of the driven force. The simple two-level model explains this behaviour qualitatively in a limited range of the driving amplitude and frequency.
DOI
10.1209/0295-5075/26/1/001

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A periodically driven two-state dynamics, being analysed within the Floquet formalism, exhibits localization of the amplitude dynamics in an infinite frequency range, extending from the bare tunnel splitting up to infinity. In contrast, the suppression of tunnelling in a driven symmetric double well is restricted to a limited frequency regime, extending from the bare tunnel splitting up to the first resonance frequency with higher-lying states. With the amplitude dynamics of a periodically driven two-level system not being restricted to describe coherent tunnelling transport only, the localization phenomenon within the infinite frequency range does allow for novel applications for systems in strong laser fields.
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