Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.5: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II

Fractional photon-assisted tunnelling of ultra-cold atomsMartin Esmann1,2, Jonathan D. Pritchard3, Niklas Teichmann2, and •Christoph Weiss2,41Physics Department, Harvard University, Cambridge, MA 02138, USA — 2Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany — 3Department of Physics, University of Strathclyde, Glasgow, G4 0NG, United Kingdom — 4Department of Physics, Durham University, Durham DH1 3LE, United Kingdom

Fractional photon-assisted tunnelling is investigated both numerically and analytically in a periodically shaken double-well lattice [1,2]. While integer photon-assisted tunnelling is a single-particle effect, fractional photon-assisted tunnelling is an interaction-induced manybody effect. Far from being the small effect reported previously, we predicted [1] that the one-half-photon resonance is a large effect. This has subsequently been observed experimentally [3].

Fractional photon-assisted tunnelling provides a physically relevant model for which N-th order time-dependent perturbation theory can be large although all previous orders are small [2]. All predicted effects will be observable with an existing experimental setup [3].

[1] M. Esmann, N. Teichmann and C. Weiss, Phys. Rev. A 83, 063634 (2011).

[2] M. Esmann, J. Pritchard and C.Weiss, Laser Phys. Lett., in press, arXiv:1109.2735 (2011).

[3] Y.-A. Chen et al., Phys. Rev. Lett. 107, 210405, (2011).

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