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Homogeneous optical anisotropy in an ensemble of InGaAs quantum dots induced by strong enhancement of the heavy-hole band Landé parameter q

A. V. Trifonov, I. A. Akimov, L. E. Golub, E. L. Ivchenko, I. A. Yugova, A. N. Kosarev, S. E. Scholz, C. Sgroi, A. Ludwig, A. D. Wieck, D. R. Yakovlev, and M. Bayer
Phys. Rev. B 104, L161405 – Published 18 October 2021
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    Abstract

    We reveal the existence of a large in-plane heavy-hole g factor in symmetric self-assembled (001) (In,Ga)As/GaAs quantum dots due to the warping of valence-band states. This warping dominates over the well-established mechanism associated with a reduced symmetry of the quantum dots and the corresponding mixing of heavy-hole and light-hole states. The effect of band warping is manifested in a unique angular dependence of the trion photon echo signal on the direction of the external magnetic field with respect to the sample axes. It results in a uniform magnetic-field-induced optical anisotropy for the entire quantum dot ensemble which is a prerequisite for the realization of spin quantum memories and spin-photon entanglement in the ensemble.

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    • Received 18 March 2021
    • Accepted 1 September 2021

    DOI:https://doi.org/10.1103/PhysRevB.104.L161405

    ©2021 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Magnetic anisotropyOptical generation of spin carriersSpintronicsTrions
    1. Physical Systems
    Quantum dotsSemiconductor microcavities
    1. Techniques
    Density matrix methodsFour-wave mixingHomodyne & heterodyne detectionLuttinger–Kohn modelSymmetries in condensed matter
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    A. V. Trifonov1,2,*, I. A. Akimov1,3, L. E. Golub3, E. L. Ivchenko3, I. A. Yugova2, A. N. Kosarev1,3, S. E. Scholz4, C. Sgroi4, A. Ludwig4, A. D. Wieck4, D. R. Yakovlev1,3, and M. Bayer1,3

    • 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany
    • 2Spin Optics Laboratory, St. Petersburg State University, 198504 St. Petersburg, Russia
    • 3Ioffe Institute, Russian Academy of Science, 194021 St. Petersburg, Russia
    • 4Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

    • *Author to whom correspondence should be addressed: artur.trifonov@tu-dortmund.de

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    Issue

    Vol. 104, Iss. 16 — 15 October 2021

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