Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: Poster Session: Spintronics; Spin-controled transport; Topological insulators; Interfaces / Surfaces; Magnetic semiconductors
HL 29.2: Poster
Monday, March 11, 2013, 16:00–20:00, Poster A
Spin Noise Spectroscopy at Single Photon Intensities — •Julia Wiegand1, Ramin Dahbashi1, Xavier Marie2, Klaus Pierz3, Hans Werner Schumacher3, Jens Hübner1, and Michael Oestreich1 — 1Insitute for Solid State Physics, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — 2Université de Toulouse, INSA, UPS, CNRS; LPCNO, 135 avenue de Rangueil, F-31077 Toulouse, France — 3Physikalisch Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany
Spin noise spectroscopy is capable of performing quantum non-demolition measurements of spin dynamics by off-resonant optical probing [1]. However, recent reports on heavy-hole spin dephasing in self-assembled (InGa)As quantum dots (QDs) show a non-negligible influence of the probe beam intensity on the dephasing time. This is due to residual light absorption disturbing the equilibrium [2].
A Hanbury Brown and Twiss type detection setup is implemented for single QD photoluminescence detection. This setup is further modified in order to enable Faraday fluctuation measurements by single photon counting which, in principle, provides access to the truly undisturbed spin dynamics by preventing light absorption.
[1] Müller et al., Semiconductor spin noise spectroscopy: Fundamentals, accomplishments, and challenges, Physica E 43, 569 (2011).
[2] Dahbashi et al., Measurement of heavy-hole spin dephasing in (InGa)As quantum dots, Appl. Phys. Lett. 100, 031906 (2012).