Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Spintronics / Quantum Information: Materials and Methods (jointly with HL)
TT 41.3: Vortrag
Mittwoch, 13. März 2013, 15:30–15:45, H2
All-electrical time-resolved spin generation and coherent spin manipulation in n-InGaAs — •Ivan Stepanov1,2, Sebastian Kuhlen1,2, Manfred Ersfeld1,2, Stefan Göbbels1,2, Mihail Lepsa2,3, and Bernd Beschoten1,2 — 1II. Physikalisches Institut, RWTH Aachen University, 52056 Aachen, Germany — 2JARA: Fundamentals of Future Information Technology, 52074 Aachen — 3Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich
Creation and manipulation of coherent spin information by electrical means are key tasks in semiconductor spintronics.
Here we demonstrate that a coherent spin polarization can be created and manipulated by two successive electric field pulses in n- InGaAs epilayer at zero external magnetic field. The first electric pulse || [110] creates a current induced spin polarization (CISP) which is oriented in the plane of the sample. The subsequent electric field pulse || [110] generates a perpendicular magnetic field pulse [1] leading to a coherent precession of this spin polarization with 2-dimensional electrical control over the final spin orientation. Spin precession is measured by time-resolved Faraday rotation. We determine the build-up time of CISP during the first field pulse and extract the spin dephasing time and internal magnetic field strength during the spin manipulation pulse. The results are in good agreement with optical pump-probe experiments on the same device.
Work supported by DFG through FOR 912.
[1] S. Kuhlen et al., Phys. Rev. Lett. 109, 146603 (2012).