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  3. Raman Optical Activity Induced By Ferroaxial Order In Nitio_{3}.
  1. Home
  3. Raman Optical Activity Induced By Ferroaxial Order In Nitio_{3}.

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Raman Optical Activity Induced by Ferroaxial Order in NiTiO_{3}.

Gakuto Kusuno1, Takeshi Hayashida2,3, Takayuki Nagai2

  • 1Institute of Science Tokyo, Department of Physics, Tokyo 152-8551, Japan.

Physical Review Letters
|June 7, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Raman optical activity (ROA) is now observed in ferroaxial crystals, not just chiral molecules. This discovery reveals ROA as a new tool for studying ferroaxial order in centrosymmetric materials.

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Area of Science:

  • Condensed matter physics
  • Spectroscopy
  • Materials science

Background:

  • Raman optical activity (ROA) traditionally requires broken inversion or time-reversal symmetry, observed in chiral molecules and magnetic materials.
  • Ferroaxial crystals are centrosymmetric and nonmagnetic, lacking these traditional symmetry-breaking requirements.

Purpose of the Study:

  • To investigate the presence and origin of ROA in centrosymmetric ferroaxial crystals.
  • To establish ROA as a viable technique for probing ferroaxial order.

Main Methods:

  • Circularly polarized Raman spectroscopy on single-crystalline NiTiO_{3}.
  • Symmetry analysis.
  • First-principles calculations of phonons.
  • Tight-binding model calculations.

Main Results:

  • A pronounced ROA signal was observed in NiTiO_{3} in cross-circular polarization configurations.
  • The ROA signal directly correlates with the ferroaxial domain structure.
  • Theoretical analysis confirmed that ROA originates from ferroaxial order and is independent of electric dipole approximation.

Conclusions:

  • ROA can arise in centrosymmetric, nonmagnetic ferroaxial crystals.
  • Ferroaxial order is the source of this natural ROA.
  • ROA is a powerful new probe for studying ferroaxial order in such systems.