Monday, October 29, 2012

1210.7051 (Geva Arwas et al.)

Coherent transport through a quantum shuttle    [PDF]

Geva Arwas, Dotan Davidovich, Doron Cohen
A shuttle site that crosses through a band of network levels induces currents. If the process is re-cycled this can be regarded as "pumping" or "stirring". We show that the analysis reduces to that of calculating time dependent probabilities, as in the stochastic formulation, but with splitting (branching) ratios that are not bounded within $[0,1]$. Our approach allows to address the adiabatic regime, as well as the Slow and Fast non-adiabatic regimes, on equal footing. We emphasize aspects that go beyond the familiar picture of sequential Landau-Zener crossings, taking into account Wigner-type multilevel mixing due to the crossing shuttle.
View original: http://arxiv.org/abs/1210.7051

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