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arXiv · 1107.4792

Mesoscopic transport of fermions through an engineered optical lattice connecting two reservoirs

M. Bruderer·W. Belzig
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Abstract

We study transport of fermions in a system composed of a short optical lattice connecting two finite atomic reservoirs at different filling levels. The average equilibration current through the optical lattice, for strong lattice-reservoir coupling and finite temperatures, is calculated within the Landauer formalism using a nonequilibrium Green's functions approach. We moreover determine quantum and thermal fluctuations in the transport and find significant shot-to-shot deviations from the average equilibration current. We show how to control the atomic current by engineering specific optical lattice potentials without requiring site-by-site manipulations and suggest the realization of a single level model. Based on this model we discuss the blocking effect on the atomic current resulting from weak interactions between the fermions.

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M. Bruderer, W. Belzig. 2012-01-22. Mesoscopic transport of fermions through an engineered optical lattice connecting two reservoirs. https://doi.org/10.1103/physreva.85.013623

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