Electron transport through a quantum dot assisted by cavity photons

Abstract

We investigate transient transport of electrons through a single-quantum-dot controlled by a plunger gate. The dot is embedded in a finite wire that is weakly coupled to leads and strongly coupled to a single cavity photon mode. A non-Markovian density-matrix formalism is employed to take into account the full electron-photon interaction in the transient regime. In the absence of a photon cavity, a resonant current peak can be found by tuning the plunger gate voltage to lift a many-body state of the system into the source-drain bias window. In the presence of an $x$-polarized photon field, additional side peaks can be found due to photon-assisted transport. By appropriately tuning the plunger-gate voltage, the electrons in the left lead are allowed to make coherent inelastic scattering to a two-photon state above the bias window if initially one photon was present in the cavity. However, this photon-assisted feature is suppressed in the case of a $y$-polarized photon field due to the anisotropy of our system caused by its geometry.

RevTeX, 12 pages with included eps figures

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Cited by in corpus (13)

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• Manifestation of the Purcell effect in current transport through a dot-cavity-QED system
• Regimes of radiative and nonradiative transitions in transport through an electronic system in a photon cavity reaching a steady state
• Photon-induced tunability of the thermospin current in a Rashba ring
• Effects of photon field on heat transport through a quantum wire attached to leads
• Cavity-photon-switched coherent transient transport in a double quantum waveguide
• Generalized Master Equation Approach to Time-Dependent Many-Body Transport
• Coherent transient transport of interacting electrons through a quantum waveguide switch
• Competition of static magnetic and dynamic photon forces in electronic transport through a quantum dot
• Thermoelectric inversion in a resonant quantum dot-cavity system in the steady-state regime
• Boundary triplets, tensor products and point contacts to reservoirs