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We explore the asymmetric sequential Landau-Zener (LZ) dynamics in anensemble of interacting Bose condensed two-level atoms coupled with a cavityfield. Assuming the couplings between all atoms and the cavity field areidentical, the interplay between atom-atom interaction and detuning may lead toa series of LZ transitions. Unlike the conventional sequential LZ transitions,which are symmetric to the zero detuning, the LZ transitions of Bose condensedatoms in a cavity field are asymmetric and sensitively depend on the photonnumber distribution of the cavity. In LZ processes involving single excitationnumbers, both the variance of the relative atom number and the step slope ofthe sequential population ladder are asymmetric, and the asymmetry become moresignificant for smaller excitation numbers. Furthermore, in LZ processesinvolving multiple excitation numbers, there may appear asymmetric populationladders with decreasing step heights. During a dynamical LZ process, due to theatom-cavity coupling, the cavity field shows dynamical collapse and revivals.In comparison with the symmetric LZ transitions in a classical field, theasymmetric LZ transitions in a cavity field originate from thephoton-number-dependent Rabi frequency. The asymmetric sequential LZ dynamicsof Bose condensed atoms in a cavity field may open up a new way to explore thefundamental many-body physics in coupled atom-photon systems.

Asymmetric sequential Landau-Zener dynamics of Bose condensed atoms in a cavity