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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Quantum-Impurity Relaxometry of Magnetization Dynamics.

B Flebus¹, Y Tserkovnyak¹

¹Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

Physical Review Letters

|November 17, 2018

Summary

Quantum impurity relaxometry can probe magnetic insulator dynamics, detecting phase transitions like magnon condensation. This technique offers non-intrusive insights into spin dynamics and transport in magnetic materials.

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Area of Science:

Quantum sensing
Condensed matter physics
Materials science

Background:

Nitrogen-vacancy (NV) and silicon-vacancy (SiV) color centers in diamond are advanced quantum impurity prototypes.
These centers offer minimally invasive, high-resolution sensing of magnetic fields and temperature.

Purpose of the Study:

Investigate quantum impurity relaxometry for probing collective excitations in magnetic insulators.
Develop a framework linking impurity relaxation rates to magnetic system dynamics.
Explore sensitivity to dynamic phase transitions and spin transport.

Main Methods:

Utilize quantum impurity relaxometry to measure relaxation rates.
Develop a theoretical framework connecting relaxation rates to magnetic noise.
Analyze sensitivity to magnon condensation and coherent spin dynamics.

Main Results:

Established a general framework for quantum-impurity relaxometry in magnetic insulators.
Demonstrated sensitivity to dynamic phase transitions, including magnon condensation.
Identified potential for detecting coherent spin dynamics in ferromagnetic and antiferromagnetic systems.

Conclusions:

Quantum impurity relaxometry is a promising tool for studying magnetic insulators.
The technique can non-intrusively probe spin dynamics and transport phenomena.
Future applications include measuring transport coefficients in magnetic materials.