Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Fluctuations and Noise
TT 32.4: Vortrag
Donnerstag, 29. März 2007, 18:45–19:00, H18
Full counting statistics of photon-assisted transport in a quantum point contact — •Mihajlo Vanevic1, Yuli V. Nazarov2, and Wolfgang Belzig3 — 1Departement für Physik und Astronomie, Klingelbergstrasse 82, 4056 Basel, Switzerland — 2Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands — 3Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
We study the charge transport statistics in a coherent quantum point contact driven by a time-dependent voltage. We obtain that the cumulant generating function at zero temperature consists of a dc component which describes the unidirectional charge transfer and the ac component which accounts for the photon-assisted effects in the noise and higher-order even cumulants. We provide a simple interpretation in terms of electron-hole excitations and discuss the relation to the minimal excitation states for optimal Lorentzian voltage pulses. The extended Keldysh-Green’s function technique which we use is suitable for the systematic calculation of the higher-order current correlators at finite temperatures in the presence of the driving.