Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.53: Poster

Monday, April 1, 2019, 17:30–20:00, Poster E

Theoretical Description of Two-Dimensional Spectroscopy in a CdTe Quantum Dot doped with a Single Mn Ion — •Magnus Molitor, Tilmann Kuhn, and Doris Reiter — Institut für Festkörpertheorie, Wilhelm-Klemm-Straße 10, 48149 Münster

Quantum dots (QDs) doped with single Mn ions offer new opportunities in the field of spintronics. In these QDs the Mn ion behaves as a spin M=5/2 with six eigenstates M_z=± 5/2,± 3/2,± 1/2 resulting in a photoluminescence (PL) spectrum consisting of six equally spaced lines even in the absence of a magnetic field. By increasing the magnetic field, states which are coupled by the exchange interaction are brought into resonance and multiple anticrossings are observed in the PL spectrum. However, using PL alone one cannot unambiguously distinguish if these resonances arise from different non-interacting states or from a coupled system. In contrast, two-dimensional (2D) four-wave mixing (FWM) spectroscopy allows us to disentangle involved spectra.

In this contribution we study two- and three-pulse excitations to probe the coherence and population dynamics of a QD doped with a single Mn ion. We model the system as an ensemble of QDs in different Mn spin states, whereby each member is comprised of a few-level system. Our study shows that 2D FWM is able to identify and investigate coherent coupling mechanisms between the excitonic excitations and the magnetic dopant in the QD.