The effects of a far-infrared photon cavity field on the magnetization of a square quantum dot array

Abstract

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 (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. 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.

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References in corpus (5)

• Quantum Electrodynamical Density-Functional Theory: Bridging Quantum Optics and Electronic-Structure Theory
• Nonlinear response of the vacuum Rabi resonance
• Keldysh approach for non-equilibrium phase transitions in quantum optics: beyond the Dicke model in optical cavities
• Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator
• Impurity and spin effects on the magneto-spectroscopy of a THz-modulated nanostructure

Cited by in corpus (6)

• Controlling the excitation spectrum of a quantum dot array with a photon cavity
• Magneto-optical properties of a quantum dot array interacting with a far-infrared photon mode of a cylindrical cavity
• Hofstadter-like spectrum and Magnetization of Artificial Graphene constructed with cylindrical and elliptical quantum dots
• Spin-phase transition in an array of quantum rings controlled by cavity photons
• The tuning of para- and diamagnetic cavity photon excitations in a square array of quantum dots in a magnetic field
• Signatures of broken symmetries in the excitations of a periodic 2DEG coupled to a cylindrical photon cavity