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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 9: III-V semiconductors (other than nitrides)

HL 9.7: Talk

Monday, March 12, 2018, 16:45–17:00, EW 202

Increased sensitivity of spin noise spectroscopy using homodyne detection in n-doped GaAs — •Aleksandr Kamenskii1, Mikhail Petrov2, Dmitry Smirnov3, Manfred Bayer1, and Alex Greilich11Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Spin Optics Laboratory, Saint Petersburg State University, 198504 St. Petersburg, Russia — 3Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

Optical spin noise spectroscopy is a minimally invasive method of obtaining dynamical information on carrier spins by measuring mesoscopic time-dependent spin fluctuations [1-3]. We implement the homodyne detection scheme to increase the polarimetric sensitivity of the spin noise spectroscopy. Controlling the laser intensity of the local oscillator, which travels around the sample and does not perturb the measured spin system, we are able to amplify the signal. This opportunity of additional amplification allows us to reduce the probe laser intensity incident onto the sample and therefore to approach a non-perturbative regime. The efficiency of this scheme with enhancement of the detected signal by more then a factor 3 at low probe powers is demonstrated on bulk n:GaAs. Additionally, the control of the optical phase provides us a possibility to switch between the measurements of Faraday rotation and Faraday ellipticity without changes in optical elements. [1] Crooker et al., Nature 431, 49 (2004). [2] Li et al., New J. Phys. 15, 113038 (2013). [3] Lucivero et al. Phys. Rev. A 93, 053802 (2016).

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