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Tue, 23 Jan 2001 00:00:00 +0100Tue, 23 Jan 2001 00:00:00 +0100Wannier-Stark resonances in semiconductor superlattices
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1153
Wannier-Stark states for semiconductor superlattices in strong static fields, where the interband Landau-Zener tunneling cannot be neglected, are rigorously calculated. The lifetime of these metastable states was found to show multiscale oscillations as a function of the static field, which is explained by an interaction with above-barrier resonances. An equation, expressing the absorption spectrum of semiconductor superlattices in terms of the resonance Wannier-Stark states is obtained and used to calculate the absorption spectrum in the region of high static fields.M. Glück; A. R. Kolovsky; H. J. Korsch; F. Zimmerpreprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1153Tue, 23 Jan 2001 00:00:00 +0100Wannier-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 +0200