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Tue, 24 Oct 2000 00:00:00 +0200Tue, 24 Oct 2000 00:00:00 +0200Wannier-Stark states of a quantum particle in 2D lattices
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1172
A simple method of calculating the Wannier-Stark resonances in 2D lattices is suggested. Using this method we calculate the complex Wannier-Stark spectrum for a non-separable 2D potential realized in optical lattices and analyze its general structure. The dependence of the lifetime of Wannier-Stark states on the direction of the static field (relative to the crystallographic axis of the lattice) is briefly discussed.M. Glück; F. Keck; A. R. Kolovsky; H. J. Korscharticlehttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1172Tue, 24 Oct 2000 00:00:00 +0200A quantum cable car for Wannier-Stark ladders
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1170
The paper studies the dynamics of transitions between the levels of a Wannier-Stark ladder induced by a resonant periodic driving. The analysis of the problem is done in terms of resonance quasienergy states, which take into account the metastable character of the Wannier-Stark states. It is shown that the periodic driving creates from a localized Wannier-Stark state an extended Bloch-like state with a spatial length varying in time as ~ t^1/2. Such a state can find applications in the field of atomic optics because it generates a coherent pulsed atomic beam.M. Glück; A. R. Kolovsky; H.J. Korscharticlehttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1170Sat, 30 Sep 2000 00:00:00 +0200Lifetime statistics for a Bloch particle in ac and dc fields
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/908
We study the statistics of the Wigner delay time and resonance width for a Bloch particle in ac and dc fields in the regime of quantum chaos. It is shown that after appropriate rescaling the distributions of these quantities have universal character predicted by the random matrix theory of chaotic scattering.Markus Glück; A. R. Kolovsky; Hans Jürgen Korscharticlehttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/908Sat, 02 Sep 2000 00:00:00 +0200