Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Spin controlled transport I

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 Beschoten1,31II. 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.

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