DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

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 Schmalbuch1, 3, Stefan Göbbels1, 3, Marten Patt1, 3, Paul Schlammes1, 3, Christian Rodenbücher1, 3, Markus Hagedorn1, 3, Gernot Güntherodt1, 3, Thomas Schäpers2, 3, Mihael Lepsa2, 3, and Bernd Beschoten1, 31II. 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

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2009 > Dresden