Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.101: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Quantum dynamics of few ultra-cold atoms in a periodically shaken double-well superlattice — •Martin Esmann1,4, Niklas Teichmann1, Jon Pritchard3, and Christoph Weiss1,2 — 1Institut für Physik, Carl von Ossietzky Universität, 26111 Oldenburg, Germany — 2Department of Physics, Durham University, Durham, DH1 3LE, UK — 3Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK — 4Physics Department, Harvard University, Cambridge, MA 02138, USA
An analog of fractional photon-assisted tunneling (PAT) is investigated both numerically and analytically. The system under consideration is a periodically shaken optical superlattice of effectively decoupled double wells with few interacting ultra-cold Bosons per well. While previous results based on a perturbative approach suggest that the coherent transfer between the individual wells induced by PAT is a small effect [1], we introduced a resonance approximation [2] to show that for the right choice of parameters fractional PAT resonances yield major contributions to the transfer of particles. Our technique is particularly useful to investigate conditions for perfect transfer employing PAT resonances and first experimental results were recently obtained [3] in good agreement with our predictions [2,4].
[1] N. Teichmann et. al., Phys. Rev. A, 79:063620, 2009.
[2] M. Esmann et al., Phys. Rev. A, 83:063634, 2011.
[3] Y.-O. Chen et al., Phys. Rev. Lett., 107:210405, 2011.
[4] M. Esmann et al., Laser Phys. Lett., doi: 10.1002/lapl.201110109.