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Updated: May 22, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Four-Wave Mixing at peV Energy Scales.

C Simon¹, D M Silevitch¹, T F Rosenbaum¹

¹California Institute of Technology, Division of Physics, Mathematics, and Astronomy, Pasadena, California 91125, USA.

Physical Review Letters

|March 14, 2025

Summary

This summary is machine-generated.

Researchers measured nonlinear magnetic susceptibility in a quantum magnet, observing Raman scattering at low energies. The susceptibility

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Last Updated: May 22, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

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Published on: October 9, 2012

Area of Science:

Condensed Matter Physics
Quantum Magnetism
Nonlinear Optics

Background:

Disordered quantum magnets exhibit complex magnetic behaviors.
Nonlinear magnetic susceptibility (χ⁽³⁾) is crucial for understanding light-matter interactions in magnetic systems.
Quantum phenomena like Raman scattering are observable at low energy scales.

Purpose of the Study:

To measure the nonlinear magnetic susceptibility χ⁽³⁾ of LiHo₀.₀₄₅Y₀.₉₅₅F₄.
To investigate four-wave mixing via coherent (anti-)Stokes Raman scattering.
To analyze the temperature and transverse field dependence of χ⁽³⁾.

Main Methods:

Measurement of nonlinear magnetic susceptibility (χ⁽³⁾).
Observation of four-wave mixing.
Analysis of Raman scattering at peV energy scales.
Temperature and transverse field dependence studies.

Main Results:

Demonstrated four-wave mixing due to coherent (anti-)Stokes Raman scattering at ~100 Hz (peV).
Observed a temperature dependence of χ⁽³⁾ following a (1/T) form with a high-T cutoff.
Found that χ⁽³⁾ decreases monotonically with a transverse field, reaching a constant offset.

Conclusions:

The high-T cutoff in χ⁽³⁾ is linked to dissipation in coherent spin clusters.
The observed behavior suggests the interplay of coherent and spontaneous Raman scattering.
This study provides insights into nonlinear optical properties of disordered quantum magnets.