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Annika Kurzmann1, Hiske Overweg1, Marius Eich1

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|July 18, 2019
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Summary
This summary is machine-generated.

We demonstrate sensitive charge detection in bilayer graphene quantum dots using an integrated detector. This method precisely identifies single electron charging events, advancing quantum device characterization.

Keywords:
Bilayer graphenecharge detectionmultidotsquantum dottunneling

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Materials Science

Background:

  • Electrostatically defined quantum dots in bilayer graphene offer a promising platform for quantum information processing.
  • Sensitive charge detection is crucial for characterizing and controlling quantum dot devices.

Purpose of the Study:

  • To develop and demonstrate a highly sensitive integrated charge detector for bilayer graphene quantum dots.
  • To investigate the detector's ability to resolve individual electron charging events.

Main Methods:

  • Fabrication of bilayer graphene quantum dot devices using a graphite back gate without etching.
  • Integration of a secondary quantum dot as a charge detector, separated by a depletion gate.
  • Measurement of current changes in the sensing dot in response to charging events in the primary quantum dot.

Main Results:

  • Demonstrated sensitivity of the charge detector to individual charging events in the nearby quantum dot.
  • Observed steplike current changes (up to 77%) in the detector due to single electron charging.
  • Successfully detected charging states in single and coupled quantum dots with tunable barriers.

Conclusions:

  • The integrated charge detector provides a robust method for sensitive charge detection in bilayer graphene quantum dots.
  • This technique enables precise characterization of quantum dot devices, including those with tunable barriers and coupled systems.
  • The findings contribute to the advancement of quantum dot technologies for applications in quantum computing and sensing.