Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 28: Focused Session: Spin Transport and Coherence in Emerging Materials

MA 28.4: Talk

Wednesday, March 25, 2009, 16:30–16:45, HSZ 101

Optically induced spin coherence by linear polarized light in InGaAs — •Klaus Schmalbuch^{1, 3}, Stefan Göbbels^{1, 3}, Marten Patt^{1, 3}, Paul Schlammes^{1, 3}, Christian Rodenbücher^{1, 3}, Markus Hagedorn^{1, 3}, Gernot Güntherodt^{1, 3}, Thomas Schäpers^{2, 3}, Mihael Lepsa^{2, 3}, and Bernd Beschoten^{1, 3} — ¹II. Physikalisches Institut, RWTH Aachen, Templergraben 55, 52056 Aachen — ²Institut für Bio- und Nanosysteme IBN-1, Forschungszentrum Jülich, 52425 Jülich — ³JARA - Fundamentals of Future Information Technology

Optical orientation is a well established technique to optically excite electron spins in semiconductors. In conventional all-optical pump-probe experiments a circularly polarized pump beam is used to generate spin-polarized electrons by transferring angular momentum from the photons to the electrons.

We present a new method for the generation of a coherent spin ensemble by linearly polarized laser pulses. The dependency of this spin polarization on the direction of the linear pump polarization is measured by time-resolved Faraday rotation. We show that the spin polarization originates from internal magnetic fields due to bulk inversion asymmetry in zinc-blende semiconductors and quantitatively monitors the internal Dresselhaus fields.

Work   supported   by   DFG   through   FOR   912