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Controlling the error mechanism in a tunable-barrier nonadiabatic charge pump by dynamic gate compensation

Frank Hohls, Vyacheslavs Kashcheyevs, Friederike Stein, Tobias Wenz, Bernd Kaestner, and Hans W. Schumacher
Phys. Rev. B 105, 205425 – Published 20 May 2022
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Abstract

Single-electron pumps based on tunable-barrier quantum dots are the most promising candidates for a direct realization of the unit ampere in the recently revised International System of Units (SI): they are simple to operate and show high precision at high operation frequencies. The current understanding of the residual transfer errors at low temperature is based on the evaluation of back-tunneling effects in the decay cascade model. This model predicts a strong dependence on the ratio of the time-dependent changes in the quantum dot energy and the tunneling barrier transparency. Here we employ a two-gate operation scheme to verify this prediction and demonstrate control of the back-tunneling error. We derive and experimentally verify a quantitative prediction for the error suppression, thereby confirming the basic assumptions of the back-tunneling (decay cascade) model. Furthermore, we demonstrate a controlled transition from the back-tunneling dominated regime into the thermal (sudden decoupling) error regime. The suppression of transfer errors by several orders of magnitude at zero magnetic field was additionally verified by a sub-ppm precision measurement.

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  • Received 21 December 2021
  • Revised 28 March 2022
  • Accepted 5 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.205425

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Frank Hohls1,*, Vyacheslavs Kashcheyevs2, Friederike Stein1, Tobias Wenz1, Bernd Kaestner3, and Hans W. Schumacher1

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
  • 2Departments of Physics, University of Latvia, Riga LV-1002, Latvia
  • 3Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany

  • *frank.hohls@ptb.de

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Issue

Vol. 105, Iss. 20 — 15 May 2022

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