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Experimental control of transport resonances in a coherent quantum rocking ratchet

Author

Listed:
  • Christopher Grossert

    (Institut für Angewandte Physik der Universität Bonn)

  • Martin Leder

    (Institut für Angewandte Physik der Universität Bonn)

  • Sergey Denisov

    (Lobachevsky State University of Nizhny Novgorod
    Institut für Physik, Universität Augsburg
    Sumy State University)

  • Peter Hänggi

    (Lobachevsky State University of Nizhny Novgorod
    Institut für Physik, Universität Augsburg
    Nanosystems Initiative Munich)

  • Martin Weitz

    (Institut für Angewandte Physik der Universität Bonn)

Abstract

The ratchet phenomenon is a means to get directed transport without net forces. Originally conceived to rectify stochastic motion and describe operational principles of biological motors, the ratchet effect can be used to achieve controllable coherent quantum transport. This transport is an ingredient of several perspective quantum devices including atomic chips. Here we examine coherent transport of ultra-cold atoms in a rocking quantum ratchet. This is realized by loading a rubidium atomic Bose–Einstein condensate into a periodic optical potential subjected to a biharmonic temporal drive. The achieved long-time coherence allows us to resolve resonance enhancement of the atom transport induced by avoided crossings in the Floquet spectrum of the system. By tuning the strength of the temporal modulations, we observe a bifurcation of a single resonance into a doublet. Our measurements reveal the role of interactions among Floquet eigenstates for quantum ratchet transport.

Suggested Citation

  • Christopher Grossert & Martin Leder & Sergey Denisov & Peter Hänggi & Martin Weitz, 2016. "Experimental control of transport resonances in a coherent quantum rocking ratchet," Nature Communications, Nature, vol. 7(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10440
    DOI: 10.1038/ncomms10440
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    Cited by:

    1. Zhang, Peng-Juan & Zhang, Ji-Qiang & Wang, Peng & Huo, Jie & Wang, Xu-Ming, 2024. "Directed transport of two-coupled particles under the coordination of the coupling and an asymmetric potential," Chaos, Solitons & Fractals, Elsevier, vol. 182(C).
    2. Bi, Haohao & Lei, Youming & Han, Yanyan, 2019. "Stochastic resonance across bifurcations in an asymmetric system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 525(C), pages 1296-1312.

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