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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Second-order nonlinear optical effects of spin currents.

Jing Wang¹, Bang-Fen Zhu, Ren-Bao Liu

¹Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.

Physical Review Letters

|September 28, 2010

Summary

Measuring pure spin currents is challenging. This study reveals a chiral sum-frequency optical effect for longitudinal spin currents, enabling direct visualization using nonlinear optical spectroscopy.

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Area of Science:

Spintronics
Quantum Physics
Nonlinear Optics

Background:

Pure spin currents are crucial for spintronics and quantum phenomena like topological insulators.
Direct measurement of pure spin currents is difficult due to the lack of electromagnetic induction.

Purpose of the Study:

To establish a method for directly observing pure spin currents.
To explore the optical effects of spin currents.

Main Methods:

Symmetry analysis to predict chiral optical effects of spin currents.
Microscopic calculations using the eight-band model of III-V semiconductors.
Utilizing standard nonlinear optical spectroscopy.

Main Results:

A chiral sum-frequency optical effect was identified for longitudinal spin currents.
Second-order optical effects of general spin currents with unique polarization dependence were revealed.
Calculations show a sizable optical susceptibility under realistic conditions.

Conclusions:

The findings enable direct visualization of spin currents in real-time and space.
This provides a new spectroscopic toolbox for exploring spin-photon interactions.
Opens avenues for advancing spintronics and quantum information science.