Resonant phase dynamics in 0-π Sine–Gordon facets
Artikel i vetenskaplig tidskrift, 2015

A locally phase-shifted Sine–Gordon model well accounts for the phenomenology of unconventional Josephson junctions. The phase dynamics shows resonant modes similar to Fiske modes that appear both in the presence and in the absence of the external magnetic field in standard junctions. In the latter case, they are also in competition with zero field propagation of Sine–Gordon solitons, i.e., fluxons, which give rise to the so-called zero field steps in the current–voltage (I–V) of the junction. We numerically study the I–V characteristics and the resonances magnetic field patterns for some different faceting configurations, in various dissipative regimes, as a function of temperature. The simulated dynamics of the phase is analyzed for lower-order resonances. We give evidence of a nontrivial dynamics due to the interaction of propagating fluxons with localized semifluxons. Numerical results are compared with experimental outcomes obtained on high-quality high-Tc grain boundary YBCO junctions.

Sine–Gordon equation

Josephson effect

Fluxons

Författare

G. Rotoli

Università degli Studi della Campania Luigi Vanvitelli

D. Stornaiuolo

Universita degli Studi di Napoli Federico II

Karin Cedergren

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

A. Leo

Universita degli Studi di Salerno

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

F. Tafuri

Università degli Studi della Campania Luigi Vanvitelli

Continuum Mechanics and Thermodynamics

0935-1175 (ISSN) 1432-0959 (eISSN)

Vol. 27 639-658

Ämneskategorier

Nanoteknik

DOI

10.1007/s00161-014-0382-5