Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 35: Poster I
HL 35.11: Poster
Tuesday, March 8, 2016, 15:00–19:00, Poster A
Spin Noise Spectroscopy on single InAs Quantum Dots — •Julia Wiegand1, Ramin Dahbashi1, Jens Hübner1, Klaus Pierz2, and Michael Oestreich1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Abteilung Nanostrukturen, Appelstraße 2, D-30167 Hannover, Germany — 2Physikalisch Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany
The spin dynamics of electrons and holes confined in InAs quantum dots (QDs) are of particular interest for future applications in solid state quantum information processing. We implement spin noise spectroscoscopy (SNS) to access the intrinsic spin dynamics of confined carriers in individual QDs [1]. Measurements on single heavy hole spins reveal a strong magnetic field dependence of the longitudinal spin relaxation time for low magnetic fields with relaxation times up to 180 µ s [2]. The dependence of the relaxation times on the probe laser intensity suggests residual light absorption that shortens the measured times. Improvement of the SNS method for single QDs should be achieved for increased probe laser detunings, that avoid light absorption and allow for higher probe intensities to enhance the signal-to-noise ratio.
[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).