Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 64: Coherent Quantum Dynamics (joint session DY, TT, organized by DY)

TT 64.7: Talk

Thursday, March 23, 2017, 11:30–11:45, ZEU 160

Unconventional quasienergy bands in tilted optical lattices — •Onno Renke Diermann — Institut für Physik, Carl von Ossietzky Universität Oldenburg

The existence of quasienergy bands in periodically driven lattices under the influence of an additional static force has first been predicted by J.Zak [“Finite Translations in Time and Energy”, Phys. Rev. Lett 71, 2624 (1993)]. Among other things, it was suggested that within a single-band approximation such bands may take the form of cosine bands “modulated with the Bessel function of the shaking amplitude”. Considering the experimentally accessible example of ultracold atoms in deep shaken cosine lattices, we show by numerical calculations of the full quasienergy spectrum that the single-band approximation is not reliable, and the quasienergy bands in fact are broken by a multitude of multiphoton resonances. This means that particles prepared in such bands tend to heat up on short time scales, and dynamic localization will be hard to observe.