A sign error was found in the coefficient d j ; ; g in our Eq. (5). Its correct form should readConsequently, the Berry phases tend to cos in the weak coupling limit g ! 0 under the assumption that the adiabatic theorem holds. This sign error does not affect the Berry phase at g 0 and in the strong coupling limit g ! 1. We thank Li Han and Yong Guo for pointing out this error.
The Berry phase in a composite system with one driven subsystem has been studied in this Letter. We choose two coupled spin-1 / 2 systems as the composite system; one of the subsystems is driven by a time-dependent magnetic field. We show how the Berry phases depend on the coupling between the two subsystems, and the relation between the Berry phases of the composite system and those of its subsystems.
The Dynamical Casimir effect and collective excitations in atom ensemble are investigated in a non-stationary cavity. The results show that the dynamical Casimir effect leads to the collective excitations of atom ensemble due to absorption of the created photons. This remarkable feature indicates that the atom ensemble can serve as a detector for the process of photon production in a non-stationary cavity. Therefore by measuring the collective excitations of the atom ensemble, the dynamical Casimir effect can indirectly be verified.
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