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000874418 1001_ $$0P:(DE-HGF)0$$aKleinjohann, Iris$$b0
000874418 1112_ $$aNIC Symposium 2020$$cJülich$$d2020-02-27 - 2020-02-28$$wGermany
000874418 245__ $$aOptical Pumping of Electron Spins in Quantum Dot Ensembles
000874418 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2020
000874418 29510 $$aNIC Symposium 2020
000874418 300__ $$a247 - 254
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000874418 4900_ $$aPublication Series of the John von Neumann Institute for Computing (NIC) NIC Series$$v50
000874418 520__ $$aWe use the central spin model to analyse optical pumping of singly charged quantum dots. An exact quantum mechanical approach is employed to calculate the impact of several million laser pulses. The periodical excitation imprints on the system and the electron spin polarisation refocuses directly before each pulse. Our calculations link the non-monotonic behaviour of the revival amplitude as function of the external magnetic field found in experiments to the nuclear Larmor precession. Furthermore, we extend our model to a cluster of coupled central spin models to investigate long-range spin-spin interactions in quantum dot ensembles. A semiclassical approach handles the large amount of spins. By means of the cluster approach, we provide an understanding of the electron spin dephasing at different external magnetic fields and spectral widths of the optical excitation. Our model reveals the counterbalancing effects generating a constant dephasing time in dependence of the spectral laser width in experiment.
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000874418 7001_ $$0P:(DE-HGF)0$$aFischer, Andreas$$b1
000874418 7001_ $$0P:(DE-HGF)0$$aJäschke, Natalie$$b2
000874418 7001_ $$0P:(DE-HGF)0$$aAnders, Frithjof B.$$b3$$eCorresponding author
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