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MA: Fachverband Magnetismus

MA 48: Quantum Coherence and Quantum Information Systems (joint session TT/MA)

MA 48.5: Talk

Thursday, March 15, 2018, 16:15–16:30, H 2053

Mode locking in a periodically pulsed quantum dot — •Natalie Jäschke and Frithjof Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44227 Dortmund

In pump-probe experiments single electron charged semiconductor quantum dots are subjected to periodic optical excitation generating electron and nuclear spin polarization. In the short time regime the decoherence of the electron spin polarization is governed by the hyperfine interaction with the nuclear spins. We present a theory that combines the effect of the periodic laser pump pulses and the nuclear spin bath on the electron spin polarization.

While we treat the laser pumping quantum-mechanically, a classical simulation of the Overhauser field bridges the time between two laser pulses. We analyze the time dependence of the electron spin dynamics as well as the electron spin noise spectrum. Data for the non-equilibrium steady state spectral distributions of the Overhauser field are presented for the long time limit. Using a steady state Floquet condition the peak locations of the Overhauser field distribution parallel to the external magnetic field can be derived.