Dresden 2009 – wissenschaftliches Programm
HL 12.5: Vortrag
Dienstag, 24. März 2009, 10:45–11:00, BEY 81
Time-resolved studies of current induced spin polarization in strained InGaAs structures — •Markus Hagedorn1,2,3, Marten Patt1,3, Klaus Schmalbuch1,3, Gernot Güntherodt1,3, Mihail Lepsa2,3, Thomas Schäpers2,3, and Bernd Beschoten1,3 — 1II. Physikalisches Institut, RWTH Aachen — 2Institut für Bio- und Nanosysteme (IBN-1), Forschungszentrum Jülich — 3JARA - Fundamentals of Future Information Technology
The fundamental understanding of electron spin interactions in non-magnetic semiconductor heterostructures and the controlled manipulation of spins are crucial for realizing novel spintronic devices.
The well established all-optical pump/probe schemes as experimental methods for the creation and detection of coherent spins are nowadays supplemented by means of electrical pumping.
The underlying mechanisms which enable the so-called current induced spin polarization (CISP) are internal effective magnetic fields evoked by the broken inversion symmetry of the zinc-blende structure in III-V semiconductor materials (Dresselhaus term) and additionally by the strain in, e.g., InGaAs/GaAs heterostructures.
We report on detection and manipulation of electron spins by time-resolved CISP. Spins are generated by ultrafast current pulses. The spin polarization is probed spatio-temporally by Faraday rotation in polar geometry.
Work supported by DFG through FOR912.