Localization condition for two-level systems
classification
❄️ cond-mat
keywords
localizationperiodicdynamicsexternalpotentialsystemsystemstwo-level
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The dynamics of two-level systems in an external periodic field are investigated in general. The necessary conditions of localization are obtained through analysing the time-evolving matrix. It is found that localization is possible if not only is the dynamics of the system periodic, but also its period is the same as that of the external potential. A model system in a periodic $\delta$-function potential is studied thoroughly.
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