Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Focus Session: Electron Spin Qubits in Semiconductor Quantum Dots (organized by HL)

TT 25.8: Talk

Monday, March 31, 2014, 17:45–18:00, POT 051

ESR Spin manipulation in spin light emitting diodes — •Andreas Merz, Jan Siller, Heinz Kalt, and Michael Hetterich — Inst. für angew. Physik KIT, Karlsruhe, Germany

Electron spin resonance is one of the most promising mechanisms to enable coherent quantum information processing. In spin light emitting diodes (spin-LEDs) we are able to initialize single electron spins all electrically by injecting them through a ZnMnSe spin-aligner layer into single self-assembled InGaAs quantum dots (QDs) with up to 100% fidelity. In a 53GHz microwave (MW) cavity we are able to manipulate the 3d Mn spin system of the spin aligner resonantly and detect the spin manipulation after the injection of band electrons into the QDs. We can optically observe the effect by analyzing the circular polarization of the recombination radiation during electrical excitation of the spin-LED for the magnetic field tuned such that the MW is resonant with the spin splitting in the Mn system. Furthermore we are able to differentiate between the resonant spin heating and non-resonant lattice heating of an amplified MW pulse for longer pulse lengths and pure spin heating for sub-microsecond MW pulses. The understanding of these mechanisms plays an important role for MW spin manipulation of single electron spins in semiconductor QDs on a ns timescale.