The orbital and spin magnetization of a cavity-embedded quantum dot array defined in a GaAs heterostructure are calculated within quantum-electrodynamical density-functional theory. To this end, a gradient-based exchange-correlation functional recently employed for atomic systems is adapted to the hosting two-dimensional electron gas submitted to an external perpendicular homogeneous magnetic field. Numerical results reveal the polarizing effects of the cavity photon field on the electron charge distribution and nontrivial changes of the orbital magnetization. We discuss its intertwined dependence on the electron number in each dot, and on the electron-photon coupling strength. In particular, the calculated dispersion of the photon-dressed electron states around the Fermi energy as a function of the electron-photon coupling strength indicates the formation of magnetoplasmon-polaritons in the dots.
Bibliographical noteFunding Information:
This work was financially supported by the Research Fund of the University of Iceland and the Icelandic Infrastructure Fund. The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. V. Mughnetsyan and V.G. acknowledge support by the Armenian State Committee of Science (Grant No 21SCG-1C012). V. Mughnetsyan acknowledges support by the Armenian State Committee of Science (Grant No 21T-1C247). V. Moldoveanu acknowledges financial support from the Romanian Core Program PN19-03 (Contract No. 21 N/08.02.2019).
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