2013/08/21 by Nzar Rauf Abdullah, Chi-Shung Tang, Andrei Manolescu +1
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Anisotropy #Electron #Photoexcitation #Photon #Plunger #Quantum and electron transport phenomena #Quantum dot #Scattering #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1088/0953-8984/25/46/465302
published as The Journal of Physics: Condensed Matter 25, 465302 (2013) · RevTeX, 12 pages with included eps figures
arxiv created 2013/08/21 · openalex publication_date 2013/10/17 · arxiv updated 2013/11/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate transient transport of electrons through a single quantum dot controlled by a plunger gate. The dot is embedded in a finite wire with length Lx assumed to lie along the x-direction with a parabolic confinement in the y-direction. The quantum wire, originally with hard-wall confinement at its ends, ±Lx/2, is weakly coupled at t = 0 to left and right leads acting as external electron reservoirs. The central system, the dot and the finite wire, is 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 undergo 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.