Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Transport: Fluctuations and Noise

TT 18.1: Vortrag

Montag, 31. März 2014, 15:00–15:15, HSZ 204

Energy noise in a voltage-driven quantum point contact — •Federica Haupt, Francesca Battista, and Janine Splettstößer — Institut für Theorie der Statistischen Physik, RWTH Aachen, Germany

Single electron sources are of key importance in research fields such as metrology and quantum electron optics [1]. Ideally, these time-periodically driven devices emit a controlled number of particles in each driving period. This is predicted to be reached when applying a series of Lorentzian-shaped pulses to the conductor [2]. In experimental realisations, the shot noise provides a tool to measure the precision with which particles are emitted. In particular, it is sensitive to extra electron-hole excitations induced by the driving itself [3,4].

In order to complement the investigations on the electron-hole pair creation based on the study of charge transport [5,6], we address the energy transport properties of a quantum point contact subject to a periodic driving. In particular, we discuss features of the driving in the energy current and the low-frequency energy noise, and show that the latter carries detailed informations on the energetics of the particle-like excitations transmitted through the conductor [7].
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F. Battista, F. Haupt, J. Splesttoesser, in preparation.