Tunneling of localized excitations: giant enhancement due to fluctuations

Details Tunneling of localized excitations: giant enhancement due to fluctuations Tunneling of localized excitations: giant enhancement due to fluctuations

2000-09-27

arxiv.org/abs/cond-mat/0009419v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, includes 11 figures

Scientific paper

10.1103/PhysRevB.63.094304

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.

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