Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Poster Session: Ge/Si/SiC / III - V Semiconductors

HL 24.2: Poster

Montag, 26. März 2012, 16:00–19:00, Poster D

Detection of high frequency spin dynamics via ultrafast spin noise spectroscopy — •Jan Gerrit Lonnemann, Fabian Berski, Hendrik Kuhn, Petrissa Zell, 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 proven to be a powerful experimental technique to explore spin dynamics in semiconductors [1], however, the bandwidth of the photoreceivers has been a limiting factor if trying to detect high frequency spin noise. In pioniering Experiments Müller et al. showed that this obstacle can be overcome by utilising pulsed lasers [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 sensitive to spin dephasing rates that exceed the repetition rate of the laser system. Due to this spin lifetimes as short as 1 ns and lamor precession frequency above 40 GHz have been observed.

[1] Georg M. Müller, Michael Oestreich, Michael Römer, and Jens Hübner; Semiconductor spin noise spectroscopy: Fundamentals, accomplishments, and challenges; Physica E, 43; 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; 121202 (2010).

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