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HL: Fachverband Halbleiterphysik
HL 32: Spin Phenomena in Semiconductors
HL 32.4: Vortrag
Mittwoch, 20. März 2024, 15:45–16:00, EW 015
Extension of the coherent optical response from the trions localized in InGaAs quantum dots — •Alexander Kosarev1,2, Artur Trifonov2,3, Irina Yugova3, Iskander Yanibekov3, Sergey Poltavtsev2,3, Aleksandr Kamenskii2, Sven Scholz4, Carlo Alberto Sgroi4, Arne Ludwig4, Andreas Wieck4, Dmitri Yakovlev2, Manfred Bayer2, and Ilya Akimov2 — 1Technical University Berlin, Germany — 2Technical University Dortmund, Germany — 3St. Petersburg, Russia — 4Ruhr-University Bochum, Germany
A sequence of optical pulses can store the optical fields in the ensemble of quantum emitters and subsequently retrieve them in the form of photon echoes (PE). The limiting factor for such storage is the decoherence time of the quantum emitter, which can be extended by transferring the coherence from the emitter to its spin degrees of freedom, which was earlier seen in bulk material and quantum wells. In the work, we report such an extension of the coherent response by an order of magnitude to 4 ns, observed on the negatively charged InGaAs self-assembled quantum dots using three-pulse spin-dependent PE in the moderate transverse magnetic field. We revealed that the non-zero transverse hole g-factor must be accounted in the temporal evolution of such systems because of its strong impact on the long-lived PE signal. Thus, transfer of the coherence from the emitter to the optical degrees of freedom with a subsequent retrieval was first observed in ensembles of the quantum dots, non-zero transverse hole g-factor was accounted in the existing model to describe evolution of such system.
Keywords: quantum dots; photon echo; coherent spectroscopy