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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Transport: Fluctuations and Noise

TT 18.1: Talk

Monday, March 31, 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].
J. P. Pekola et al., arxiv:1208.4030 (2012)
J. Keeling et al., Phys. Rev. Lett. 97, 116403 (2006)
J. Gabelli and B. Reulet, Phys. Rev. B 87, 075403 (2013)
J. Dubois et al., Nature 502, 659 (2013)
M. Vanevic Y. V. Nazarov, and W. Belzig, Phys. Rev. Lett. 99, 076601 (2007)
M. Vanevic and W. Belzig, Phys. Rev. B 86, 241306 (2012)
F. Battista, F. Haupt, J. Splesttoesser, in preparation.

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