Repulsive fluxons in a stack of Josephson junctions perturbed by a cavity

✍ Scribed by S. Madsen; N.F. Pedersen; P.L. Christiansen

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 254 KB
• Volume: 468
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.11.029

✦ Synopsis

The BSCCO type intrinsic Josephson junction has been modeled as a stack of inductively coupled long Josephson junctions, which were described by a system of coupled sine-Gordon equations. In a system of 10 long Josephson junctions coupled to a linear cavity, we numerically investigate how the cavity perturbs fluxon motion in the junctions. Fluxons in neighboring junctions are repulsive leading to anti-phase motion. The cavity provides a force which perturbs this anti-phase motion, and may even force the fluxons to build a square lattice, i.e. to perform in-phase motion. For different values of the inductive coupling strength, we investigate the cavity current, fluxon phase difference, and current-voltage characteristic. The stack-cavity system with in-phase fluxon motion may be utilized as a THz oscillator.