Phys. Rev. Lett. 84, 745–748 (2000)Observation of Breathers in Josephson LaddersReceived 7 May 1999; published in the issue dated 24 January 2000 We report on the observation of spatially localized excitations in a ladder of small Josephson junctions. The excitations are whirling states which persist under a spatially homogeneous force due to the bias current. These states of the ladder are visualized using a low temperature scanning laser microscopy. We also compute breather solutions with high accuracy in corresponding model equations. The stability analysis of these solutions is used to interpret the measured patterns in the I-V characteristics. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.745
DOI:
10.1103/PhysRevLett.84.745
PACS:
74.50.+r, 05.45.Yv, 63.20.Ry
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