Discrete breathers in nonlinear lattices: Experimental detection in a Josephson array

Details Discrete breathers in nonlinear lattices: Experimental detection in a Josephson array Discrete breathers in nonlinear lattices: Experimental detection in a Josephson array

1999-04-10

arxiv.org/abs/cond-mat/9904144v1

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, submitted to Physical Review

Scientific paper

10.1103/PhysRevLett.84.741

We present an experimental study of discrete breathers in an underdamped Josephson-junction array. Breathers exist under a range of dc current biases and temperatures, and are detected by measuring dc voltages. We find the maximum allowable bias current for the breather is proportional to the array depinning current while the minimum current seems to be related to a junction retrapping mechanism. We have observed that this latter instability leads to the formation of multi-site breather states in the array. We have also studied the domain of existence of the breather at different values of the array parameters by varying the temperature.

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