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Researchers induced stable matter vortices in liquid crystals using light beams. These vortices persist below the instability threshold, with their phase distribution creating stationary molecular textures, offering a novel vortex phase singularity solution.

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Area of Science:

  • Physics
  • Materials Science
  • Nonlinear Dynamics

Background:

  • Nematic liquid crystals exhibit complex behaviors under external stimuli.
  • Vortices are topological defects with unique properties in various physical systems.
  • Understanding light-matter interactions in liquid crystals is crucial for optical device development.

Purpose of the Study:

  • To investigate the induction and behavior of stable matter vortices in homeotropic nematic liquid-crystal cells.
  • To analyze the underlying physics of vortex persistence and the formation of stationary molecular textures.
  • To explore a novel type of vortex phase singularity solution.

Main Methods:

  • Induction of matter vortices using a light beam on a voltage-controlled liquid-crystal cell with a photosensitive wall.
  • System analysis through controlled voltage reduction to observe vortex disappearance and texture formation.
  • Theoretical modeling using a forced Ginzburg-Landau amplitude equation.
  • Comparison of theoretical predictions with experimental observations and numerical simulations.

Main Results:

  • A stable matter vortex was successfully induced at the center of the light beam in the liquid-crystal cell.
  • Upon voltage decrease, the vortex vanished from the illuminated area, leaving a stationary molecular texture.
  • The Ginzburg-Landau model demonstrated that the vortex persists in a 'shadow' region below the instability threshold.
  • The observed stationary texture was attributed to the phase distribution of the persistent vortex.

Conclusions:

  • The study presents a novel type of vortex phase singularity solution in liquid crystals.
  • The persistence of vortices below the instability threshold and their role in forming molecular textures are confirmed.
  • The findings offer new insights into light-matter interactions and topological defects in condensed matter systems.