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Although coupling to a super-Ohmic bosonic reservoir leads only to partialdephasing on short time scales, exponential decay of coherence appears in theMarkovian limit (for long times) if anharmonicity of the reservoir is takeninto account. This effect not only qualitatively changes the decoherencescenario but also leads to localization processes in which superpositions ofspatially separated states dephase with a rate that depends on the distancebetween the localized states. As an example of the latter process, we study thedecay of coherence of an electron state delocalized over two semiconductorquantum dots due to anharmonicity of phonon modes.Comment: 4 pages, 1 figure; moderate changes; auxiliary material added; to  appear in Phys. Rev. Let

Change of Decoherence Scenario and Appearance of Localization due to Reservoir Anharmonicity