Experimental control of transport resonances in a coherent quantum rocking ratchet

Christopher Grossert (), Martin Leder, Sergey Denisov, Peter Hänggi and Martin Weitz ()
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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
Peter Hänggi: Lobachevsky State University of Nizhny Novgorod
Martin Weitz: Institut für Angewandte Physik der Universität Bonn

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms10440

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