Dresden 2006 – wissenschaftliches Programm

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SYIM: Intrinsic Modes

SYIM 2: Intrinsic Modes II

SYIM 2.2: Hauptvortrag

Donnerstag, 30. März 2006, 17:30–18:00, HSZ 04

Intrinsically Localized Modes in Josephson Arrays — •Ken Segall — Colgate University, Hamilton, NY 13346 USA

Intrinsically Localized Modes (ILMs) are believed to exist in variety of condensed matter systems. One system in which they have been observed experimentally is in arrays of superconducting Josephson junctions. ILMs in Josephson arrays are also known as Discrete Breathers due to the discreteness of the individual junctions. The dynamics of a Josephson junction is similar to that of a damped and driven pendulum, a basic nonlinear element. A Josephson junction’s physical parameters are easily controlled by micro-fabrication techniques; thus coupled junctions form an ideal system to study nonlinear phenomena such as nonlinear localization. This talk will review the experimental progress on ILMs in Josephson arrays to date. We will focus on the different types of Discrete Breathers, and how in fact they have been experimentally observed. We will also look at how Discrete Breathers can interact with other excitations such as linear resonances or nonlinear vortices. Finally, we will discuss how a 3-junction circuit similar to a Discrete Breather can be potentially used in an application involving Josephson junctions as single photon detectors.