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arXiv · 2103.13653

Strong enhancement of heavy-hole Land\'e factor $q$ in InGaAs symmetric quantum dots revealed by coherent optical spectroscopy

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·M. Bayer
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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 warping of valence band states. This warping dominates over the well-established mechanism associated with a reduced symmetry of 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 a trion photon echo signal on the direction of 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 realization of spin quantum memories and spin-photon entanglement in the ensemble.

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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, M. Bayer. 2021-03-25. Strong enhancement of heavy-hole Land\'e factor $q$ in InGaAs symmetric quantum dots revealed by coherent optical spectroscopy. https://doi.org/10.1103/physrevb.104.l161405

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