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Counting Statistics for Electron Capture in a Dynamic Quantum Dot

Lukas Fricke, Michael Wulf, Bernd Kaestner, Vyacheslavs Kashcheyevs, Janis Timoshenko, Pavel Nazarov, Frank Hohls, Philipp Mirovsky, Brigitte Mackrodt, Ralf Dolata, Thomas Weimann, Klaus Pierz, and Hans W. Schumacher
Phys. Rev. Lett. 110, 126803 – Published 20 March 2013
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Abstract

We report noninvasive single-charge detection of the full probability distribution Pn of the initialization of a quantum dot with n electrons for rapid decoupling from an electron reservoir. We analyze the data in the context of a model for sequential tunneling pinch-off, which has generic solutions corresponding to two opposing mechanisms. One limit considers sequential “freeze-out” of an adiabatically evolving grand canonical distribution, the other one is an athermal limit equivalent to the solution of a generalized decay cascade model. We identify the athermal capturing mechanism in our sample, testifying to the high precision of our combined theoretical and experimental methods. The distinction between the capturing mechanisms allows us to derive efficient experimental strategies for improving the initialization.

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  • Received 8 November 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.126803

© 2013 American Physical Society

Authors & Affiliations

Lukas Fricke1, Michael Wulf1, Bernd Kaestner1,*, Vyacheslavs Kashcheyevs2,3, Janis Timoshenko2,3, Pavel Nazarov2,3, Frank Hohls1, Philipp Mirovsky1, Brigitte Mackrodt1, Ralf Dolata1, Thomas Weimann1, Klaus Pierz1, and Hans W. Schumacher1

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
  • 2Faculty of Computing, University of Latvia, Riga LV-1586, Latvia
  • 3Faculty of Physics and Mathematics, University of Latvia, Riga LV-1002, Latvia

  • *bernd.kaestner@ptb.de

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Vol. 110, Iss. 12 — 22 March 2013

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