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Double transfer through Dirac points in a tunable honeycomb optical lattice

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Abstract

We report on Bloch-Zener oscillations of an ultracold Fermi gas in a tunable honeycomb lattice. The quasi-momentum distribution of the atoms is measured after sequentially passing through two Dirac points. We observe a double-peak feature in the transferred fraction to the second band, both as a function of the band gap at the Dirac points and the quasi-momentum of the trajectory. Our results are in good agreement with a simple analytical model based on two successive Landau-Zener transitions. Owing to the variation of the potential gradient over the cloud size, coherent Stückelberg oscillations are not visible in our measurements. This effect of the harmonic confinement is confirmed by a numerical simulation of the dynamics of a trapped 2D system.

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Authors and Affiliations

  1. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland

    Thomas Uehlinger, Daniel Greif, Gregor Jotzu, Leticia Tarruell & Tilman Esslinger

  2. LP2N - UMR 5298, Université Bordeaux 1, IOGS, CNRS, Institut d’Optique d’Aquitaine, Allée René Laroumagne, 33400, Talence, France

    Leticia Tarruell

  3. Theoretische Physik, ETH Zurich, 8093, Zurich, Switzerland

    Lei Wang & Matthias Troyer

Authors
  1. Thomas Uehlinger
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  2. Daniel Greif
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  3. Gregor Jotzu
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  4. Leticia Tarruell
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  5. Tilman Esslinger
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  6. Lei Wang
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  7. Matthias Troyer
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Correspondence to Thomas Uehlinger.

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Uehlinger, T., Greif, D., Jotzu, G. et al. Double transfer through Dirac points in a tunable honeycomb optical lattice. Eur. Phys. J. Spec. Top. 217, 121–133 (2013). https://doi.org/10.1140/epjst/e2013-01761-y

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  • DOI: https://doi.org/10.1140/epjst/e2013-01761-y

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