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Double transfer through Dirac points in a tunable honeycomb optical lattice

Uehlinger, Thomas ; Greif, Daniel ; Jotzu, Gregor ; Tarruell, Leticia ; Esslinger, Tilman ; Wang, Lei ; Troyer, Matthias

In: The European Physical Journal Special Topics, 2013, vol. 217, no. 1, p. 121-133

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    Titre
    • Double transfer through Dirac points in a tunable honeycomb optical lattice
    Auteur
    • Uehlinger, Thomas. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland
    • Greif, Daniel. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland
    • Jotzu, Gregor. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland
    • Tarruell, Leticia. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland
    • Esslinger, Tilman. Institute for Quantum Electronics, ETH Zurich, 8093, Zurich, Switzerland
    • Wang, Lei. Theoretische Physik, ETH Zurich, 8093, Zurich, Switzerland
    • Troyer, Matthias. Theoretische Physik, ETH Zurich, 8093, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • The European Physical Journal Special Topics, 2013, vol. 217, no. 1, p. 121-133. Springer-Verlag
    Autre version électronique
    Classification
    • Physique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:321756
    Summary
    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