Quantum limited heterodyne detection of spin noise

Spinnoise spectroscopy is a powerful technique for studying spin relaxation in semiconductors. In this article, we propose an extension of this technique based on opticalheterodyne detection of spinnoise, which provides several key advantages compared to conventional spinnoise spectroscopy:detection of high frequency spinnoise not limited bydetector bandwidth or sampling rates of digitizers, quantum limited sensitivity even in case of very weak probe power, and possible amplification of the spinnoise signal.Heterodyne detection of spinnoise is demonstrated on insulating n-doped GaAs. From measurements of spinnoise spectra up to 0.4 Tesla, we determined the distribution ofg-factors, Δg/g = 0.49%.

Source: Review of Scientific Instruments - September 23, 2016 Category: Physics Authors: S. Cronenberger and D. Scalbert Source Type: research