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A nonmonotonic behavior of band bending φ S as a function of cesium coverage ϑ on the Cs/GaAs(001) surface is observed in the form of several maxima and minima. This behavior indicates the formation of the quasi-discrete spectrum of the adatom-induced electronic surface states. The hysteresis of the φ S (ϑ) dependence under adsorption and subsequent thermodesorption of cesium indicates the metastability of the Cs/GaAs(001) system.
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Zhuravlev et al. (2009) studied this question.
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