Radiofrequency driving of coherent electron spin dynamics in n -GaAs detected by Faraday rotation

We suggest a pump-probe method for studying semiconductor spin dynamics based on pumping of carrier spins by a pulse of oscillating radiofrequency (rf) magnetic field and probing by measuring the Faraday rotation of a short laser pulse. We demonstrate this technique on n-GaAs and observe the onset a...

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Published in:Physical review. B 2019-04, Vol.99 (16), p.1, Article 161205
Main Authors: Belykh, V. V., Yakovlev, D. R., Bayer, M.
Format: Article
Language:English
Subjects:
Coherence
Electron spin
Faraday effect
Optical pumping
Radio frequency
Rotation
Spin dynamics
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description We suggest a pump-probe method for studying semiconductor spin dynamics based on pumping of carrier spins by a pulse of oscillating radiofrequency (rf) magnetic field and probing by measuring the Faraday rotation of a short laser pulse. We demonstrate this technique on n-GaAs and observe the onset and decay of coherent spin precession during and after the course of rf pulse excitation. We show that the rf field resonantly addresses the electron spins with Larmor frequencies close to that of the rf field. This opens the opportunity to determine the homogeneous spin coherence time T2, that is inaccessible directly in standard all-optical pump-probe experiments.
doi_str_mv 10.1103/PhysRevB.99.161205
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Coherence
Electron spin
Faraday effect
Optical pumping
Radio frequency
Rotation
Spin dynamics
title Radiofrequency driving of coherent electron spin dynamics in n -GaAs detected by Faraday rotation
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