We report on the evidence of anomalous currents in graph-shaped arrays of Josephson junctions along peculiar branches of the networks. The specific case of a star-shaped array is considered and the evidence of the anomalies is achieved by comparing the current-voltage characteristics of the arrays embedded in the star structure with those of “reference” arrays which are fabricated by-side the network structure and are dc-isolated from these. The experimental data are consistent with the results of a theoretical model predicting gradients of the populations of Cooper pairs on the islands situated in proximity of the central superconductive island as a result of a Bose–Einstein condensation process.
Lorenzo, M., Lucci, M., Merlo, V., Ottaviani, I., Salvato, M., Cirillo, M., et al. (2014). On Bose-Einstein Condensation in Josephson Junctions Star Graph Arrays. PHYSICS LETTERS A, 378(7-8), 655-658 [10.1016/j.physleta.2013.12.032].
On Bose-Einstein Condensation in Josephson Junctions Star Graph Arrays
LUCCI, MASSIMILIANO;MERLO, VITTORIO;OTTAVIANI, IVANO;SALVATO, MATTEO;CIRILLO, MATTEO;
2014-01-01
Abstract
We report on the evidence of anomalous currents in graph-shaped arrays of Josephson junctions along peculiar branches of the networks. The specific case of a star-shaped array is considered and the evidence of the anomalies is achieved by comparing the current-voltage characteristics of the arrays embedded in the star structure with those of “reference” arrays which are fabricated by-side the network structure and are dc-isolated from these. The experimental data are consistent with the results of a theoretical model predicting gradients of the populations of Cooper pairs on the islands situated in proximity of the central superconductive island as a result of a Bose–Einstein condensation process.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
