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Related Experiment Video

Updated: May 24, 2026

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

Published on: August 2, 2016

Deterministic Josephson vortex ratchet with a load.

M Knufinke¹, K Ilin, M Siegel

¹Physikalisches Institut-Experimentalphysik II and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 10, 2012

Summary

This summary is machine-generated.

We experimentally studied a Josephson vortex ratchet, a fluxon particle in a Josephson junction. We measured its loading capability and efficiency, finding it can move particles against a force, demonstrating its potential for energy conversion.

Related Experiment Videos

Last Updated: May 24, 2026

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli

Published on: August 2, 2016

Area of Science:

Condensed Matter Physics
Superconductivity
Nonlinear Dynamics

Background:

Josephson junctions exhibit complex dynamics, including vortex motion.
Asymmetric potentials can rectify particle motion, creating a 'ratchet' effect.
Understanding vortex ratchet behavior is key to developing superconducting devices.

Purpose of the Study:

To experimentally investigate a deterministic underdamped Josephson vortex ratchet.
To quantify the ratchet's loading capability, output power, and efficiency.
To develop a simple analytic model for the quasistatic regime.

Main Methods:

Experimental setup involving a Josephson junction with an asymmetric periodic potential.
Application of sinusoidal driving current to induce vortex motion.
Measurement of vortex stopping current to determine ratchet strength and performance metrics.

Main Results:

The Josephson vortex ratchet rectifies fluxon motion, producing measurable dc voltage.
The ratchet's loading capability was experimentally determined by measuring the counterforce required to stop vortex motion.
A simple analytic model accurately describes the ratchet's figures of merit in the quasistatic regime.

Conclusions:

The Josephson vortex ratchet demonstrates efficient particle transport against a bias force.
Experimental results validate the theoretical model for quasistatic operation.
This work provides insights into the performance limits and potential applications of Josephson vortex ratchets.