Related Experiment Video
Updated: Mar 9, 2026

Picometer-Precision Atomic Position Tracking through Electron Microscopy
Published on: July 3, 2021
Probe of symmetry reduction at domain walls by nonlinear Cherenkov measurement
Abstract:
We report on the investigation of symmetrical properties of lithium niobate (LiNbO3) domain walls utilizing the nonlinear Cherenkov radiation. Compared with LiNbO3 bulk crystals, new nonzero elements of the χ(2) tensor at domain walls are found by the Cherenkov second harmonic generation (CSHG) and Cherenkov sum frequency generation (CSFG) measurement. Experimentally, we demonstrate the symmetry reduction of domain walls, where the mirror inversion symmetry of LiNbO3 lattice is broken while the threefold rotational symmetry still remains.
Related Concept Videos
Symmetry in Maxwell's Equations
Gauss's Law: Planar Symmetry
Gauss's Law: Cylindrical Symmetry
Gauss's Law: Spherical Symmetry
Symmetry
Standing Waves in a Cavity

