Spin-phase transition in an array of quantum rings controlled by cavity photons
arXiv:2411.13176 · doi:10.1103/PhysRevB.111.115304
Abstract
We model a spin-phase transition in a two-dimensional square array, or a lateral superlattice, of quantum rings in an external perpendicular homogeneous magnetic field. The electron system is placed in a circular cylindrical far-infrared photon cavity with a single circularly symmetric photon mode. Our numerical results reveal that the spin ordering of the two-dimensional electron gas in each quantum ring can be influenced or controlled by the electron-photon coupling strength and the energy of the photons. The Coulomb interaction between the electrons is described by a spin-density functional approach, but the para- and the diamagnetic electron-photon interactions are modeled via a configuration interaction formalism in a truncated many-body Fock-space, which is updated in each iteration step of the density functional approach. In the absence of external electromagnetic pulses this spin-phase transition is replicated in the orbital magnetization of the rings. The spin-phase transition can be suppressed by a strong electron-photon interaction. In addition, fluctuations in the spin configuration are found in dynamical calculations, where the system is excited by a time-dependent scheme specially fit for emphasizing the diamagnetic electron-photon interaction.
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References in corpus (23)
- Cavity-controlled chemistry in molecular ensembles
- Ultrastrong coupling of the cyclotron transition of a two-dimensional electron gas to a THz metamaterial
- A 10-qubit solid-state spin register with quantum memory up to one minute
- Octopus, a computational framework for exploring light-driven phenomena and quantum dynamics in extended and finite systems
- Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator
- Collective, Coherent, and Ultrastrong Coupling of 2D Electrons with Terahertz Cavity Photons
- Cavity Born-Oppenheimer Approximation for Correlated Electron-Nuclear-Photon Systems
- Ab-initio Optimized Effective Potentials for Real Molecules in Optical Cavities: Photon Contributions to the Molecular Ground state
- Electromagnetic coupling in tight-binding models for strongly correlated light and matter
- Polaritonic Hofstadter Butterfly and Cavity-Control of the Quantized Hall Conductance
- Quantum Electrodynamical Bloch Theory with Homogeneous Magnetic Fields
- Landau polaritons in highly non-parabolic 2D gases in the ultra-strong coupling regime
- Effects of screening on the Hofstadter butterfly
- In-situ Tuning of the Electric Dipole Strength of a Double Dot Charge Qubit: Charge Noise Protection and Ultra Strong Coupling
- Reduced Density-Matrix Approach to Strong Matter-Photon Interaction
- Simple Exchange-Correlation Energy Functionals for Strongly Coupled Light-Matter Systems based on the Fluctuation-Dissipation Theorem
- Real-Space, Real-Time Approach to Quantum-Electrodynamical Time-Dependent Density Functional Theory
- Spin Ensemble Density Functional Theory for Inhomogeneous Quantum Hall Systems
- Programmable Quantum Processors based on Spin Qubits with Mechanically-Mediated Interactions and Transport
- The effects of a far-infrared photon cavity field on the magnetization of a square quantum dot array
- 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
- The tuning of para- and diamagnetic cavity photon excitations in a square array of quantum dots in a magnetic field