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• W1539417300 abstract "We report a comprehensive study of stochastic electron spin fluctuations---spin noise---in lightly doped ($n$-type) bulk GaAs, which are measured using sensitive optical magnetometry based on off-resonant Faraday rotation. Frequency spectra of electron spin noise are studied as a function of electron density, magnetic field, temperature, probe-laser wavelength and intensity, and interaction volume. Electron spin lifetimes ${ensuremath{tau}}_{s}$ are inferred from the width of the spin noise spectra and are compared to direct measurements of ${ensuremath{tau}}_{s}$ using conventional Hanle-effect methods. Both methods reveal a strong and similar dependence of ${ensuremath{tau}}_{s}$ on the wavelength and intensity of the probe laser, highlighting the undesired influence of sub-bandgap absorption effects on the nominally ``nonperturbative'' spin noise measurements. As a function of temperature, the spin noise power increases approximately linearly from 1.5 to 30 K, as expected for degenerate electrons obeying Fermi-Dirac statistics, but with an additional zero-temperature offset. Finally, as the cross-sectional area of the probe laser shrinks and fewer electrons are probed, the measured Faraday rotation fluctuations due to electron spin noise are shown to increase, as expected." @default.
• W1539417300 created "2016-06-24" @default.
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• W1539417300 date "2009-01-29" @default.
• W1539417300 modified "2023-10-01" @default.
• W1539417300 title "Spin noise of conduction electrons in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>n</mml:mi></mml:math>-type bulk GaAs" @default.
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• W1539417300 doi "https://doi.org/10.1103/physrevb.79.035208" @default.
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