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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Controlling three-dimensional vortices using multiple and moving external fields.

Nirmali Prabha Das¹, Sumana Dutta¹

¹Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.

Physical Review. E

|September 28, 2017

Summary

This summary is machine-generated.

Scientists spatially controlled scroll waves, which cause lethal arrhythmias, using electric fields and thermal gradients. This research offers insights into controlling wave dynamics in excitable media.

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Area of Science:

Chemical kinetics
Nonlinear dynamics
Physiology

Background:

Scroll waves in excitable media, such as cardiac tissue, are implicated in life-threatening arrhythmias.
External control of these wave phenomena is crucial for therapeutic interventions and fundamental understanding.

Purpose of the Study:

To demonstrate the spatial control of scroll waves using external electric fields and thermal gradients.
To investigate the influence of combined electric and thermal stimuli on scroll wave dynamics.

Main Methods:

Experiments were conducted using the Belousov-Zhabotinsky reaction as a model excitable medium.
Scroll wave trajectories were manipulated using rotating electric fields and applied thermal gradients.
Numerical simulations based on a reaction-diffusion model were employed to analyze and corroborate experimental findings.

Main Results:

A scroll ring was induced to follow cyclic trajectories under a rotating electric field.
The addition of a thermal gradient altered the scroll wave's motion and trajectory characteristics.
Experimental observations were consistent with numerical simulation results.

Conclusions:

External electric fields and thermal gradients provide effective means for the spatial control of scroll waves.
Combined stimuli offer nuanced control over wave dynamics in excitable systems.
This work has implications for understanding and potentially mitigating arrhythmias in cardiac tissue.