Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices

Esmann, M. and Pritchard, J.D. and Weiss, C. (2012) Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices. Laser Physics Letters, 9 (2). pp. 160-168. ISSN 1612-2011

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Abstract

Fractional photon-assisted tunneling is investigated both numerically and analytically in a double-well lattice. While integer photon-assisted tunneling is a single-particle effect, fractional photon-assisted tunneling is an interaction-induced many-body effect. Double-well lattices with few particles in each double well are ideal to study this effect far from the mean-field effects. It is predicted that the 1/4-resonance is observable in such systems. Fractional photon-assisted tunneling provides a physically relevant model, for which N-th order time-dependent perturbation theory can be large although all previous orders are small. All predicted effects will be observable with an existing experimental setup [1].