Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.34: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Enhanced spin noise spectroscopy by interferometric detection — •Jennifer Haack, Ramin Dahbashi, Fabian Berski, Jens Hübner, and Michael Oestreich — Leibniz Universität Hannover, Institut für Festkörperphysik, Abteilung Nanostrukturen, Appelstraße 2, D-30167 Hannover, Germany

We present an enhanced method for minimally invasive measurements of the spin dynamic. In the past few years spin noise spectroscopy (SNS) has emerged into a versatile tool to study different semiconductor spin systems [1], e.g., bulk GaAs, quantum wells, and even individual quantum dots [2]. Especially the measurements on single hole spins in InAs quantum dots have pointed out very long spin lifetimes but despite very low laser intensities there was still a significant perturbation limiting the detectable intrinsic hole spin lifetime [2]. Therefore we introduce homodyne detection as an extension to the standard SN detection. Homodyne detection amplifies the signal by a local oscillator interfering with the conventional SN probe laser. We show a first experimental validation of this detection scheme yielding an increased signal to noise ratio in the well understood example system of Rb vapor [3].

[1] J. Hübner, F. Berski, R. Dahbashi, and M. Oestreich, physica status solidi (b) 251, 1824 (2014).

[2] R. Dahbashi, J. Hübner, F. Berski, K. Pierz, and M. Oestreich, Phys. Rev. Lett 112, 156601 (2014).

[3] H. Horn, G.M. Müller, E. Rasel, L. Santos, J. Hübner, and M. Oestreich, Phys. Rev. A 84, 043851 (2011).