Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Spintronics / Quantum Information: Materials and Methods (jointly with HL)

TT 41.9: Talk

Wednesday, March 13, 2013, 17:15–17:30, H2

Spin Noise Spectroscopy: Towards Solid-State Entanglement — •Fabian Berski¹, Agnes Beichert¹, Jens Hübner¹, Andreas Wieck², and Michael Oestreich¹ — ¹Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — ²Ruhr-Universität Bochum, Angewandte Festkörperphysik, Universitätsstr. 150, D-44780 Bochum, Germany

We study spin dynamics of naturally confined, non-interacting donor electrons in Gallium Arsenide at low temperatures by means of all optical spin noise spectroscopy [1]. The MBE grown sample shows the intriguing feature of localised spins in an environment of stochastically oriented magnetic moments: The orientation of the electron spin is lost on two different timescales which results from the interplay between the spin degree of freedom of the lattice and of the electron. The first timescale is attributed to the transversal component of the electron spin with respect to the nuclear magnetic field inside the donor volume and is determined to 4.5+-3ns. The second timescale is at least two orders of magnitude longer and is linked with the longitudinal component. An extension of the electron spin relaxation time would be possible via initilizing the surrounding spin bath by dynamic nuclear polarization which simplifies the generation and verification of entanglement [2].

[1] G. M. Müller, et al., Physica E: 43, 569 (2010).

[2] S. Simmons, et al., Nature: 470, 69 (2011).