Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

Abstract

We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity–photon reservoir coupling, the mean photon number in the reservoir, the electron–photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron–photon coupling strength. In the selected range of the parameters, the electron–photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity–reservoir coupling, while they decrease with increasing electron–photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.

Conversion of the stacking orientation of bilayer graphene due to \break the interaction of BN-dopants

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“…The basic composition includes a mono-component photocatalyst such as TiO 2 [40], WO 3 [41], ZnO [42], Cu 2 S [43], etc. Even optimized by doping or surface photosensitization, these materials exhibit disadvantages related to charge recombination, limited absorption range and low chemical stability [44][45][46]. The multi-component photocatalyst, called heterostructures, benefit from the extended light spectra being able to use UV, visible or near infra-red photoexcitation depending on their energy band gaps values and ability to produce oxidative radicals involved in organic pollutants removal.…”

Generalized Master Equation Approach to Time-Dependent Many-Body Transport

“…On the other hand are slow rates of FIR or terahetz active transitions, that are furthermore affected by the geometry of the wavefunctions of the corresponding final and initial states. In addition, the cavity decay, or coupling to the environment, affects relaxation times as we address below [ 98 ]. To avoid confusion it is important to remember that we calculate the eigenstates of the closed central system, the interacting electron and photon system, and the opening up of the system to the leads or the external photon reseroir is always a neccessary triggering mechanism for all transitions later in time, photon active or not.…”

“…The steady-state Markovian formalism has been used to investigate oscillations in the transport current as the photon energy or the electron–photon coupling strenght are varied with or without flow of photons from the external reservoir [ 112 , 113 ]. Moreover, the formalism has been used to establish the signs of the Purcell effect [ 114 ] in the transport current [ 98 ].…”