Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 91: Poster Session: Spintronics / Magnetic Semiconductors / Transport

HL 91.1: Poster

Donnerstag, 29. März 2012, 16:00–19:00, Poster D

Microwave influence on the electroluminescence of single InGaAs quantum dots — •Benjamin Wolter, Andreas Merz, Robert Schittny, Robin Schwerdt, Gunter Wüst, Pablo Asshoff, Michael Hetterich, and Heinz Kalt — Karlsruhe Institute of Technology (KIT) and DFG Center for Funtional Nanostructures (CFN), 76131 Karlsruhe, Germany

We investigate the effects of high-frequency microwave radiation (53 GHz) in different intensity regimes on the emission of single quantum dots in spin-injection light emitting diodes (spin-LEDs). A specially prepared spin-LED is placed in a microwave cavity and is exposed to the microwave radiation with different powers and frequencies. At low microwave powers an enhancement of the electro-luminescence emission was detected whereas at higher power the emission quenches due to thermal heating. Furthermore the influence at high static magnetic fields is investigated to proceed towards spin manipulation of single electron spins in InGaAs quantum dots.