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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Skin Effect of Nonlinear Optical Responses in Antiferromagnets
Hang Zhou1,2, Rui-Chun Xiao1,3, Shu-Hui Zhang4
1Institute of Physical Science and Information Technology, <a href="https://ror.org/05th6yx34">Anhui University</a>, Hefei 230601, China.
Physical Review Letters
|December 23, 2024
Summary
Nonlinear optical responses in antiferromagnets show a surface skin effect, concentrating near surfaces rather than throughout the bulk. This discovery opens new avenues for antiferromagnetic optospintronics.
Area of Science:
- Physics
- Materials Science
- Optoelectronics
Background:
- Nonlinear optics is crucial for fundamental physics and optoelectronic devices.
- Bulk nonlinear optical responses are typically collective phenomena in noncentrosymmetric crystals.
Purpose of the Study:
- To investigate the spatial distribution of nonlinear optical responses in antiferromagnets.
- To challenge the conventional understanding of bulk nonlinear optical phenomena.
Main Methods:
- Theoretical prediction and analysis of nonlinear optical responses.
- Focus on A-type layered antiferromagnets as representative systems.
- Examination of surface-specific phenomena like bulk photovoltaic effect and second harmonic generation.
Main Results:
- Nonlinear optical responses in antiferromagnets exhibit a surface skin effect, accumulating near surfaces.
- Inversion symmetry is locally preserved deep within antiferromagnets, limiting bulk responses.
- Observed responses decay rapidly away from the surfaces.
Conclusions:
- Nonlinear optical responses in antiferromagnets are surface-localized, not bulk phenomena.
- This surface effect is linked to antiferromagnetism and occurs in various antiferromagnets.
- Uncovers new opportunities for high-performance antiferromagnetic optospintronics.
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