SFX Bicocca-Insubria(opens in a new window)|Library catalogue(opens in a new window)| Order Document | Export | Download | Add to List | More... Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties Volume 80, Issue 7, July 2000, Pages 1311-1316 Supercurrent decay by vortex nucleation in the presence of an array of pinning centres: A renormalization group approach (Article) Iengo, R.a, Jug, G.bc a International School for Advanced Studies, Via Beirut 4, 34014 Trieste, Italy b Istituto Nazionale per la Fisica della Materia, Dipartimento di Scienze, Università dell'Insubria, Via Lucini 3, 22100 Como, Italy c Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany View additional affiliations Abstract We study the phenomenon of decay of a supercurrent in a superconducting thin film due to the spontaneous homogeneous nucleation of quantized vortex-antivortex pairs in the absence of an external magnetic field and in the presence of a periodic pinning potential. We describe the vortex nucleation by means of a Schwinger-type path-integral calculation including the effects of quantum dissipation. The overdamped case is treated exactly, while the case in which a periodic array of pinning centres is present is dealt with by means of a renormalization group (RG) approach in frequency space. This yields an approximate but very appealing analytic result for the dependence of the vortex nucleation rate on the externally driven supercurrent. In this formula the rate dependence displays oscillations which are connected to the pinning periodicity and correspond to the vortex nucleation length probing over the pinning sites as the current density is varied. Our RG treatment describes the vortex nucleation process in both the confined and the mobile phases of the dissipation-driven localization transition characterizing the motion of dissipating quantum particles in a periodic potential.

Supercurrent Decay by Vortex Nucleation in the Presence of an Array of Pinning Centres: a Renormalization Group Approach

JUG, GIANCARLO
2000

Abstract

SFX Bicocca-Insubria(opens in a new window)|Library catalogue(opens in a new window)| Order Document | Export | Download | Add to List | More... Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties Volume 80, Issue 7, July 2000, Pages 1311-1316 Supercurrent decay by vortex nucleation in the presence of an array of pinning centres: A renormalization group approach (Article) Iengo, R.a, Jug, G.bc a International School for Advanced Studies, Via Beirut 4, 34014 Trieste, Italy b Istituto Nazionale per la Fisica della Materia, Dipartimento di Scienze, Università dell'Insubria, Via Lucini 3, 22100 Como, Italy c Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany View additional affiliations Abstract We study the phenomenon of decay of a supercurrent in a superconducting thin film due to the spontaneous homogeneous nucleation of quantized vortex-antivortex pairs in the absence of an external magnetic field and in the presence of a periodic pinning potential. We describe the vortex nucleation by means of a Schwinger-type path-integral calculation including the effects of quantum dissipation. The overdamped case is treated exactly, while the case in which a periodic array of pinning centres is present is dealt with by means of a renormalization group (RG) approach in frequency space. This yields an approximate but very appealing analytic result for the dependence of the vortex nucleation rate on the externally driven supercurrent. In this formula the rate dependence displays oscillations which are connected to the pinning periodicity and correspond to the vortex nucleation length probing over the pinning sites as the current density is varied. Our RG treatment describes the vortex nucleation process in both the confined and the mobile phases of the dissipation-driven localization transition characterizing the motion of dissipating quantum particles in a periodic potential.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11383/1488452
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