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The imaginary Kapitza pendulum

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arxiv 1310.5309 v1 pith:NYR6D3AH submitted 2013-10-20 quant-ph

The imaginary Kapitza pendulum

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keywords kapitzaimaginarypotentialcomplexentirelyhighoscillatingpendulum
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We extend the theory of Kapitza stabilization within the complex domain, i.e. for the case of an imaginary oscillating potential. At a high oscillation frequency, the quasi-energy spectrum is found to be entirely real-valued, however a substantial difference with respect to a real potential emerges, that is the formation of a truly bound state instead of a resonance. The predictions of the Kapitza averaging method and the transition from a complex to an entirely real-valued quasi-energy spectrum at high frequencies are confirmed by numerical simulations of the Schrodinger equation for an oscillating Gaussian potential. An application and a physical implementation of the imaginary Kapitza pendulum to the stability of optical resonators with variable reflectivity is discussed.

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