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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.47: Poster

Donnerstag, 19. März 2020, 10:00–13:00, P1A

Homodyne Spin Noise Spectroscopy of Single Quantum Dots — •Pavel Sterin, Kai Hühn, Julia Wiegand, Jens Hübner, and Michael Oestreich — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany

Spin noise spectroscopy (SNS) is a technique that can be used to investigate the spin dynamics of sensitive semiconductor systems in a quasi-non-perturbative way. However, for the most delicate systems like, e.g., single InGaAs quantum dots it seemed that SNS had reached its limits: classic setups exhibit an electrical noise that dominates the measurements at intensities low enough to keep the residual absorption acceptable [1]. Further reduction of the intensity is limited by prohibitively long integration times [3].

We propose a setup that employs homodyne SNS as first demonstrated by [2],[3] and [4]. An all optical amplification is realized by coupling the experiment to a homodyne interferometer. This modification enables efficient integration times and a quantum-limited, i.e., optimal, signal-to-noise ratio. Finally, the new setup will allow us to gain insight into unperturbed spin dynamics of single quantum dots.

[1] Dahbashi, et al. Phys. Rev. Lett. 112, 156601, (2014).

[2] Cronenberger, et al. Rev. Sci. Instrum. 87, 093111 (2016).

[3] Sterin, et al. Phys. Rev. Applied 9, 034003 (2018).

[4] Petrov, et al. Phys. Rev. B 97, 125202 (2018).