Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.32: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Stokes Polarimetry of the Voigt Effect in Semiconductors — •Pavel Sterin, Fabian Berski, Agnes Beichert, Jens Hübner, and Michael Oestreich — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany

The recently observed intriguing connection between spin-polarization control of optically injected carriers by linearly polarized light and magnetically induced birefringence raises the need in a method of precise characterization of the light beam polarization [1]. This birefringence in non-centrosymmetric materials under the influence of magnetic fields is known as the macroscopic Voigt effect and can cause significant changes of the degree of linear polarization. The change in polarization scales with the second power of the applied transversal magnetic field strength and depends strongly on parameters like the angle of incidence, the sample temperature, and the laser energy.

Here, we employ a self-built Stokes polarimeter and develop a customized Mueller-matrix formalism, which allows us to recover all important magnetic field dependent polarization properties of the light. We accurately investigate this setup and determine its limitations and applicability for such highly sensitive measurements [2].

[1] K. Schmalbuch, S. Göbbels, P. Schäfers, C. Rodenbücher, P. Schlammes, T. Schäpers, M. Lepsa, G. Güntherodt, B. Beschoten, Phys. Rev. Lett., 105, 246603 (2010) [2] C. Flueraru, S. Latoui, J. Besse, P. Legendre, IEEE T INSTRUM MEAS, 57, 731 (2008)