Regensburg 2004 – scientific programme
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TT: Tiefe Temperaturen
TT 8: Postersitzung I: Supraleitung
TT 8.27: Poster
Monday, March 8, 2004, 14:30–19:00, Poster A
Low Tc Josephson Junction response to an ultrafast laser pulse — •Procolo Lucignano1,2, Arturo Tagliacozzo1,2, and Giacomo Rotoli1,3 — 1Dipartimento di Scienza Fisiche, Universitá Federico II Napoli, via Cinthia 80126 Napoli, Italy — 2Coherentia INFM, Italy — 3Dipartimento di Energetica, Universitá di L’Aquila, Localitá Monteluco, 67040 L’Aquila, Italy
We study the perturbation on the Josephson current induced when one of the superconducting contacts is exposed to a single ultrafast laser pulse radiation. Released energy is so small and the pulse duration so short that coherence is not degradated. Relaxation properties and nonequilibrium effect of the irradiated contact are taken into account within the framework of a quasiclassical time dependent Keldysh formalism [1]. The classical dynamics of a Josephson irradiated junction is simulated numerically using our analytical results as source term. The switching out of the zero voltage state can be easily controlled by tuning the laser light intensity [2].
[1] W. Belzig, F.K. Wilhelm, G. Schön, C. Bruder, and A.D. Zaikin, Superlattices and Microstructures 25, 1251-1288 (1999) and J. Rammer,H. Smith, Rev. Mod. Phys., 58, 323,(1986)
[2] P. Lucignano, F.J. Hekking, A. Tagliacozzo in Proceedings of MQC2 ed. A. Legget, P. Silvestrini, B. Ruggiero, and preprints