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DY: Dynamik und Statistische Physik

DY 52: Quantum chaos II

DY 52.1: Talk

Friday, March 28, 2003, 11:30–11:45, G\"OR/226

Fano resonances with discrete breathers — •Andrey Miroshnichenko and Sergej Flach — Max-Planck-Institut für Physik komplexer Systeme, NöthnitzerStrasse 38, D-01187 Dresden, Germany

A theoretical study of linear wave scattering by time-periodic spatially localized excitations (discrete breathers (DB)) is presented. We obtain that the wave propagation is strongly influenced by a local coupling between an open and closed channels generated by the DB. A peculiar effect of total reflection occurs due to a Fano resonance when a localized state originating from closed channels resonates with the open channel. For the discrete nonlinear Schrödinger chain we provide with an analytical result for the frequency dependence of the transmission coefficient, including the possibility of resonant reflection. We extend the analysis to chains of weakly coupled anharmonic oscillators and discuss the relevance of the effect for electronic transport spectroscopy of mesoscopic systems.