Particle renormalizations in presence of dissipative environments

Details Particle renormalizations in presence of dissipative environments Particle renormalizations in presence of dissipative environments

2007-06-10

arxiv.org/abs/0706.1362v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures. Revised version has extended the numerical data with some modified conclusions

Scientific paper

10.1103/PhysRevB.78.125322

We study the Aharonov-Bohm oscillations of a charged particle on a ring of radius R coupled to a dirty metal environment. With Monte-Carlo methods we evaluate the curvature of these oscillations which has the form 1/M*R^2, where M* is an effective mass. We find that at low temperatures T the curvature approaches at large R>l an R independent M*>M, where l is the mean free path in the metal. This behavior is also consistent with perturbation theory in the particle - metal coupling parameter. At finite temperature T we identify dephasing lengths that scale as T^{-1} at R>l and as T^{-1/4} at R<

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