Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Poster Session I

HL 44.33: Poster

Dienstag, 15. März 2011, 18:00–21:00, P3

Experimental realisation of ultrafast spin noise spectroscopy — •Jan Gerrit Lonnemann, Georg Müller, Jens Hübner, and Michael Oestreich — Institute for Solid State Physics, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany

Semiconductor spin noise spectroscopy has evolved as a powerful experimental technique to explore spin dynamics in close vicinity to thermal equilibrium [1], however, the application of a continuous wave laser limits the detectable spin frequencies to the bandwidth of the photoreceivers. Sampling the spin fluctuations with pulsed laser light allows detection of spin noise at GHz frequencies that are only limited by the inverse pulse width [2]. However this implementation is in general restricted to spin dephasing rates that are smaller than the laser repetition rate. We present the experimental relalization of a complementary technique [3] that is exclusively sensitive to spin dephasing rates that exceed the repetition rate of the laser system. This experiment will pave the way towards application of spin noise spectroscopy even at room temperature.

[1] Georg M. Müller, Michael Oestreich, Michael Römer, and Jens Hübner; Semiconductor spin noise spectroscopy: Fundamentals, accomplishments, and challenges; Physica E, 43(2):569 - 587, 2010.

[2] Georg M. Müller, Michael Römer, Jens Hübner, and Michael Oestreich; Gigahertz spin noise spectroscopy in n -doped bulk GaAs; Phys. Rev. B, 81(12):121202, Mar 2010.

[3] Sebastian Starosielec and Daniel Hägele; Ultrafast spin noise spectroscopy; Applied Physics Letters, 93(5):051116, 2008.