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arXiv · 2102.02780

Resonant spin amplification in Faraday geometry

P. Schering·E. Evers·V. Nedelea·D. S. Smirnov·E. A. Zhukov·D. R. Yakovlev·M. Bayer·G. S. Uhrig·A. Greilich
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Abstract

We demonstrate the realization of the resonant spin amplification (RSA) effect in Faraday geometry where a magnetic field is applied parallel to the optically induced spin polarization so that no RSA is expected. However, model considerations predict that it can be realized for a central spin interacting with a fluctuating spin environment. As a demonstrator, we choose an ensemble of singly-charged (In,Ga)As/GaAs quantum dots, where the resident electron spins interact with the surrounding nuclear spins. The observation of RSA in Faraday geometry requires intense pump pulses with a high repetition rate and can be enhanced by means of the spin-inertia effect. Potentially, it provides the most direct and reliable tool to measure the longitudinal $g$ factor of the charge carriers.

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P. Schering, E. Evers, V. Nedelea, D. S. Smirnov, E. A. Zhukov, D. R. Yakovlev, M. Bayer, G. S. Uhrig, A. Greilich. 2021-02-04. Resonant spin amplification in Faraday geometry. https://doi.org/10.1103/physrevb.103.l201301

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