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The dynamics of a kicked quantum mechanical wavepacket at a quantum resonanceis studied in the framework of Floquet analysis. It is seen how a directedcurrent can be created out of a homogeneous initial state at certain resonancesin an asymmetric potential. The almost periodic parameter dependence of thecurrent is found to be connected with level crossings in the Floquet spectrum.Comment: 8 pages, 4 figures, submitted to Phys. Rev.

Directed transport and Floquet analysis for a periodically kicked wave packet at a quantum resonance