Photon assisted tunneling through three quantum dots with spin-orbit-coupling

Abstract

The effect of an ac electric field on quantum transport properties in a system of three quantum dots, two of which are connected in parallel while the third is coupled to one of the other two, is investigated theoretically. Based on the Keldysh nonequilibrium Green's function method, the spin-dependent current, occupation number and spin accumulation can be obtained in our model. An external magnetic flux, Rashba spin orbit coupling (SOC) and intradot Coulomb interactions are considered. The magnitude of the spin-dependent average current and the positions of the photon assisted tunneling (PAT) peaks can be accurately controlled and manipulated by simply varying the strength of the coupling and the frequency of the ac field. A particularly interesting result is the observation of a new kind of PAT peak and a multiple electron-photon pump effect that can generated and controlled by the coupling between the quantum dots. In addition, the spin occupation number and spin accumulation can be well controlled by the Rashba SOC and the magnetic flux.

Photon assisted electron transport through T-shaped double quantum dot molecule A–B interferometer

“…5. The phenomenon is similar to 13 that of parallel double quantum dot A-B interferometer [18] . It means that partial transport properties through parallel double quantum dot A-B interferometer are preserved.…”

“…In addition, dc IV  curves display as a multiple-step fashion, which originates from the appearance of a series of sideband peaks corresponding to different photon-assisted tunneling processes. The results are in agreement with those obtained in Ref [16,18]…”

“…When the signal of light field is applied to the quantum devices, the information of light field will affect electron transport, which will cause some novel photon assisted tunneling phenomenon [15][16][17][18] . Du [16] has investigated the resonant photon-assisted tunneling through a coupled double-quantum-dot system, the idea of photon 3 sidebands or additional tunneling channels is used to explain the behaviors of the time-averaged current.…”

“…They found that the side resonant peaks emerge around the Kondo peak due to the absorption and emission of photons. For photon assisted tunneling through three quantum dot system, a new kind of photon assisted tunneling peaks and a multiple electron-photon pump effect are observed and can be controlled by the coupling between quantum dots [18] .…”

Photon exchange and entanglement formation during transmission through a rectangular quantum barrier

“…The behavior of a quantum particle exposed to an oscillating rectangular potential has been studied by several authors under different aspects involving, for example, tunneling time [1,2] , chaotic signatures [3,4] , appearance of Fano resonances [5] , Floquet scattering for strong fields [6] and its absence for non-Hermitian potentials [7] , chiral tunneling [8] , charge pumping [9] and other photon assisted quantum transport phenomena in theory [10–12] and experiment [13–18] , recently realized particularly in quantum dots [19–22] .…”