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Tunneling of localized excitations: giant enhancement due to fluctuations

We consider the tunneling of localized excitations (many boson bound states) in the presence of a bosonic bath. We show both analytically and numerically that the bath influence results in a dramatical enhancement of the amplitude of the excitation tunneling. The order of the bosonic flow in the course of the tunneling process is obtained. On the background of the giant tunneling enhancement we observe and describe additional resonant enhancement and {\sl suppression} of tunneling due to avoided level crossings.

preprint2000arXivOpen access
S. FlachV. FleurovA. A. Ovchinnikov
cond-mat.stat-mech
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Open access3 authors1 topic
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S. FlachV. FleurovA. A. Ovchinnikov

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