Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 4: Spintronics: Nanostructures and Optics

HL 4.12: Talk

Monday, March 7, 2016, 12:45–13:00, H13

Time-resolved electrical detection of the Spin Galvanic effect after ps optical excitation — •Manfred Ersfeld¹, Ivan Stepanov¹, Mihail Lepsa², and Bernd Beschoten¹ — ¹2nd Institute of Physics, RWTH Aachen University, Germany — ²Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich GmbH, Germany

Direct conversion of electron spin precession in semiconductor heterostructures into a detectable electrical voltage plays an important role in many spintronic concepts. Here we report on the first time-resolved electrical measurement of the spin galvanic effect (SGE) probed by spin dependent photo-voltages in n-InGaAs. Phase triggering of electron spin coherence is achieved by circularly polarized picosecond laser pulses. Electron spin precession in a transverse external magnetic field can be directly monitored as voltage oscillations using a phase-triggered sampling oscilloscope as a probe. The strong crystal axis anisotropy of the spin-orbit interaction allows analyzing the predicted dependence of the spin-dependent photo-voltage on the strength of the spin-orbit interaction. In contrast to previous theoretical predictions, the amplitude of the SGE does not depend on the spin-orbit coupling strength.