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Manipulating Ferroelectric Topological Polar Structures with Twisted Light.

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Summary
This summary is machine-generated.

Twisted ultraviolet light with orbital angular momentum (OAM) controls ferroelectric polarization in CsBiNb2O7 crystals. This structured light enables deterministic manipulation of ferroic states and topological excitations, paving the way for reconfigurable devices.

Keywords:
Bloch Points and Anti Bloch PointsMerons and HopfionsOrbital angular momentumPolar VorticesQuazi‐2D FerroelectricsTwisted light Raman Spectroscopybragg coherent x‐ray diffractive imagingdata storageenergy harvestinginformation processingtwisted and structured light

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Photonics

Background:

  • Controlling non-equilibrium states is a key challenge.
  • Terahertz fields and soft phonon modes influence ferroelectricity.
  • Twisted light with orbital angular momentum (OAM) offers a new route to manipulate ferroelectric order and topological excitations.

Purpose of the Study:

  • Demonstrate control of ferroelectric polarization using non-resonant twisted ultraviolet (UV) light.
  • Investigate the role of OAM in manipulating ferroic states and stabilizing topological excitations.
  • Establish structured light as a tool for deterministic control of ferroic states.

Main Methods:

  • Utilized quasi-2D CsBiNb2O7 (CBNO) single crystals.
  • Employed non-resonant twisted UV light (375 nm, 800 THz).
  • Combined in situ X-ray Bragg coherent diffractive imaging (BCDI), twisted optical Raman spectroscopy, and density functional theory (DFT).

Main Results:

  • Resolved 3D ionic displacements, strain fields, and polarization changes.
  • Observed light-induced strain hysteresis, indicating nonlinear, history-dependent ferroelastic switching driven by OAM.
  • Documented discrete, irreversible domain transitions and stabilization of non-trivial domain textures (vortex-antivortex pairs, merons) that persist after OAM removal, showing a memory effect.

Conclusions:

  • Structured light provides deterministic and reversible control of ferroic states.
  • OAM-driven ferroelastic switching and topological defect stabilization are demonstrated.
  • Findings enable optically reconfigurable non-volatile devices.