Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1 (jointly with DY)

TT 4.9: Vortrag

Montag, 16. März 2015, 12:00–12:15, H 0104

Influence of quadrupolar interactions in the anisotropic central spin model — •Johannes Hackmann and Frithjof B. Anders — Technische Universität Dortmund, Lehrstuhl für theoretische Physik II, 44221 Dortmund, Germany

We have investigated spin noise in an ensemble of semiconductor quantum dots (QDs). A single electron (or hole) doped QD is described by the anisotropic central spin model. Additionally, the quadrupole moments of the nuclei couple to strain induced electric fields in the QD. We investigated the influence of these quadrupolar couplings on the central spin dynamics, that are calculated via the correlation functions ⟨ S^z (t) S^z ⟩ and ⟨ S^z (ω) S^z ⟩. We demonstrate that our results are in good agreement with recent experiments and show that quadrupolar interactions have a large impact on measurements on hole doped QDs, while they almost are negligible for the case of electron doped QDs.