Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster Session: Spintronics; Spin-controled transport; Topological insulators; Interfaces / Surfaces; Magnetic semiconductors
HL 29.11: Poster
Montag, 11. März 2013, 16:00–20:00, Poster A
Spin Dynamics of Heavy-Holes in (InGa)As Quantum Dots — •Ramin Dahbashi1, Julia Wiegand1, 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
The spin dynamics of heavy-holes confined in (InGa)As quantum dots (QDs) are of particular interest for future applications in solid state quantum information processing. We employ spin noise spectroscopy as a quantum non-demolition experiment to get access to the intrinsic spin dynamics [1]. The spin noise method is transferred from ensembles of QDs [2] to single dot heavy-hole measurements. Numerical simulations show an extremely long spin dephasing time if light absorption is negligible [2]. The investigated QDs are characterized by polarization resolved photoluminescence measurements and via a Hanbury Brown-Twiss setup. The discharging of the QDs via Auger recombination due to residual light absorption is deactivated by co-pumping the dots with low intensity light.
[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).