Related Experiment Video
Updated: Jan 30, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
SQUID ratchet: Statistics of transitions in dynamical localization
Jakub Spiechowicz1, Jerzy Łuczka1
1Institute of Physics, University of Silesia, 41-500 Chorzów, Poland.
Abstract:
We study occupation of certain regions of phase space of an asymmetric superconducting quantum interference device (SQUID) driven by thermal noise, subjected to an external ac current and threaded by a constant magnetic flux. Thermally activated transitions between the states which reflect three deterministic attractors are analyzed in the regime of the noise induced dynamical localization of the Josephson phase velocity, i.e., there is a temperature interval in which the conditional probability of the voltage to remain in one of the states is very close to one. Implications of this phenomenon on the dc voltage drop across the SQUID are discussed. We detect the emergence of the power law tails in a residence time probability distribution of the Josephson phase velocity and discuss the role of symmetry breaking in dynamical localization induced by thermal noise. This phenomenon illustrates how deterministic-like behavior may be extracted from randomness by stochasticity itself. It reveals another face of noise.
Related Concept Videos
Phase Transitions
Statistical Significance
Phase Transitions: Vaporization and Condensation
Phase Transitions: Sublimation and Deposition
Properties of Transition Metals
Cooperative Allosteric Transitions

