Detta är en digital seminarieserie i kondenserade materiens fysik och atomfysik, med syfte att koppla samman forskare från olika nordiska universitet. Samtalen är informella och ska inspirera till diskussioner och interaktioner.
The orbital and spin magnetization of a cavity-embedded quantum square dot array defined in a GaAs heterostructure are calculated within quantum-electrodynamical density-functional theory (QEDFT). To this end, a gradient-based exchange-correlation functional recently employed for atomic systems is adapted to the hosting two-dimensional electron gas (2DEG) submitted to an external perpendicular homogeneous magnetic field. The functional was derived through the adiabatic-connection fluctuation-dissipation theorem by J. Flick [1] and could facilitate the investigation of the effects of cavity photons on extended 2DEG systems. 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 [2].
[1] J. Flick, Phys. Rev. Lett. 129, 143201 (2022).
[2] V. Gudmundsson et al, Phys. Rev. B 106, 115308 (2022).
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