## Fractal stabilization of Wannier-Stark resonances

• The quasienergy spectrum of a Bloch electron affected by dc-ac fields is known to have a fractal structure as function of the so-called electric matching ratio, which is the ratio of the ac field frequency and the Bloch frequency. This paper studies a manifestation of the fractal nature of the spectrum in the system "atom in a standing laser wave", which is a quantum optical realization of a Bloch electron. It is shown that for an appropriate choice of the system parameters the atomic survival probability (a quantity measured in laboratory experiments) also develops a fractal structure as a function of the electric matching ratio. Numerical simulations under classically chaotic scattering conditions show good agreement with theoretical predictions based on random matrix theory.

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Verfasserangaben: Markus Glück, Andrey R. Kolovsky, Hans Jürgen Korsch urn:nbn:de:hbz:386-kluedo-10112 Wissenschaftlicher Artikel Englisch 2000 2000 Technische Universität Kaiserslautern 10.03.2000 Quantum mechanics ; Wannier-Stark systems ; fractals; lifetimes ; resonances Fachbereich Physik 5 Naturwissenschaften und Mathematik / 530 Physik Standard gemäß KLUEDO-Leitlinien vor dem 27.05.2011

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