Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Focus Session: Spintronics (jointly with MA)
HL 48.6: Vortrag
Mittwoch, 28. März 2012, 11:30–11:45, EW 201
Electric field-driven coherent spin reorientation and spin rephasing of optically generated electron spin packets in InGaAs — •Sebastian Kuhlen1,3, Klaus Schmalbuch1,3, Markus Hagedorn1,3, Paul Schlammes1,3, Marten Patt1,3, Mihail Lepsa2,3, Gernot Güntherodt1,3, and Bernd Beschoten1,3 — 1II. Physikalisches Institut A, RWTH Aachen University, 52074 Aachen — 2Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich — 3JARA: Fundamentals of Future Information Technology, 52074 Aachen
Full electric-field control of spin orientations is one of the key tasks in semiconductor spintronics. We demonstrate that electric field pulses can be utilized for phase-coherent 2π spin rotation of optically generated electron spin packets in InGaAs epilayers using time-resolved Faraday rotation. Through spin-orbit interaction, the electric-field pulses act as local magnetic field pulses (LMFP). By the temporal control of the LMFP, we can turn on and off electron spin precession and thereby rotate the spin direction into arbitrary orientations in a 2-dimensional plane [1]. Moreover, using two subsequent pulses of opposite polarity allows us to perform spin echo measurements by reversing the spin precession direction. Although our spin transport experiment is in the diffusive regime, we unexpectedly observe that electric field-induced spin dephasing is reversible to a large extent.
[1] S. Kuhlen et al. arXiv 1107.4307
This work has been supported by DFG through FOR912.