Magnetic-field-influenced nonequilibrium transport through a quantum ring with correlated electrons in a photon cavity

2012/09/13 by Thorsten Arnold, Chi-Shung Tang, Chi‐Shung Tang +3 · 4 citations
Computer Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Electromagnetic field #Electron #Magnetic field #Magnetic flux #Optical field #Photon #Physics #Polarization (electrochemistry) #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum electrodynamics #Quantum mechanics #Strong Light-Matter Interactions #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.87.035314

published as Phys. Rev. B 87, 035314 (2013)

arxiv created 2012/09/13 · openalex publication_date 2013/01/31 · arxiv updated 2013/07/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigate magnetic-field-influenced time-dependent transport of Coulomb interacting electrons through a two-dimensional quantum ring in an electromagnetic cavity under nonequilibrium conditions described by a time-convolutionless non-Markovian master equation formalism. We take into account the full electromagnetic interaction of electrons and cavity photons. A bias voltage is applied to semi-infinite leads along the x axis, which are connected to the quantum ring. The magnetic field is tunable to manipulate the time-dependent electron transport coupled to a photon field with either x or y polarization. We find that the lead-system-lead current is strongly suppressed by the y-polarized photon field at magnetic field with two flux quanta due to a degeneracy of the many-body energy spectrum of the mostly occupied states. On the other hand, the lead-system-lead current can be significantly enhanced by the y-polarized field at magnetic field with half-integer flux quanta. Furthermore, the y-polarized photon field perturbs the periodicity of the persistent current with the magnetic field and suppresses the magnitude of the persistent current. The spatial and temporal density distributions reflect the characteristics of the many-body spectrum. The vortex formation in the contact areas to the leads influences the charge circulation in the ring.

Citations

• Fano effect in a quantum-ring–quantum-dot system with tunable coupling
• Staying positive: going beyond Lindblad with perturbative master equations
• Coherent switching by detuning a side-coupled quantum-dot system
• Kondo effect in a one-electron double quantum dot: Oscillations of the Kondo current in a weak magnetic field
• Time-dependent simulations of electron transport through a quantum ring: Effect of the Lorentz force
• Stochastic wave-function method for non-Markovian quantum master equations
• Coherent quantum transport in narrow constrictions in the presence of a finite-range longitudinally polarized time-dependent field
• Significance of Electromagnetic Potentials in the Quantum Theory
• Fano resonance in a quantum wire with a side-coupled quantum dot
• Stochastic Processes in Physics and Chemistry

Cited by

• Electron transport through a quantum dot assisted by cavity photons
• Transmission of a microwave cavity coupled to localized Shiba states
• Single-photon controlled thermospin transport in a resonant ring-cavity system
• Excitation spectra of a quantum ring embedded in a photon cavity