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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Updated: Jul 9, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

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Published on: February 1, 2017

Controlled generation of 3D vortices in driven atomic Josephson junctions.

Vijay Pal Singh1, Ludwig Mathey2,3, Herwig Ott4

  • 1Quantum Research Center, Technology Innovation Institute, Masdar City 9639, Abu Dhabi, United Arab Emirates.

Proceedings of the National Academy of Sciences of the United States of America
|July 7, 2026
PubMed
Summary

We developed an atomic Josephson junction to generate controllable 3D solitary waves in quantum fluids. This system precisely controls vortex rings and rarefaction pulses, enabling new studies in quantum turbulence.

Keywords:
Jones-Roberts excitationsdriven Josephson junctionstopological defectsultracold atoms

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Area of Science:

  • Quantum physics
  • Fluid dynamics
  • Condensed matter physics

Background:

  • Quantum fluids exhibit complex phenomena like solitons.
  • Generating and controlling these excitations is crucial for fundamental research.

Purpose of the Study:

  • To propose a novel ac-driven atomic Josephson junction for generating 3D solitary waves.
  • To enable controlled emission and study of quantum fluid excitations.

Main Methods:

  • Utilizing an ac-driven atomic Josephson junction.
  • Leveraging the Shapiro-step phenomenon for deterministic emission.
  • Controlling barrier height to tune excitation types (vortex rings vs. rarefaction pulses).

Main Results:

  • Demonstrated generation of both vortex rings and rarefaction pulses, spanning the Jones-Roberts family of solitons.
  • Achieved deterministic single- and multi-excitation emission via Shapiro steps.
  • Observed leapfrogging dynamics and decay processes of multiple coaxial rings.

Conclusions:

  • The ac-driven Josephson junction provides a reproducible platform for studying 3D solitonic excitations.
  • This method facilitates precision studies of nonlinear vortex dynamics, dissipation, and quantum turbulence.
  • Opens avenues for exploring quantum phenomena in trapped superfluids.