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

Trifonov, A.V. and Akimov, I.A. and Golub, L.E. and Ivchenko, E.L. and Yugova, I.A. and Kosarev, A.N. and Scholz, S.E. and Sgroi, C. and Ludwig, Ar. and Wieck, A.D. and Yakovlev, D.R. and Bayer, M.

Volume: 104 Pages:
DOI: 10.1103/PhysRevB.104.L161405
Published: 2021

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. © 2021 American Physical Society.

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