Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Transport: Fluctuations and Noise

TT 3.7: Vortrag

Montag, 25. Februar 2008, 11:45–12:00, H 2053

Current correlations under AC-bias - quantum noise vs. photon-assisted transport — •Jan C. Hammer and Wolfgang Belzig — University of Konstanz, Department of Physics, Universitätsstr. 10, D-78464 Konstanz, Germany

We study coherent charge transport through a double barrier quantum dot coupled to metallic leads and driven by an AC-bias voltage. Such a voltage is produced e.g. by a laser irradiating a mesoscopic structure. For a resonant level this gives rise to photon-assisted tunneling events of electrons trough the system. The scattering formalism allows us to understand the conductance and the spectral properties of the non-symmetrized current-current correlators as an interplay between correlation induced antibunching and photon-assisted transport events. We discuss how these measurable quantities depend on the coupling to the leads, the applied bias voltage, the driving frequency and the structure of the energy levels inside the scattering region.