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Related Concept Videos

Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
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Magnetic Fields01:27

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The de Broglie Wavelength02:32

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The Electrical Double Layer01:30

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Related Experiment Video

Updated: May 11, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

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Published on: November 1, 2013

Gigahertz quantized charge pumping in graphene quantum dots.

M R Connolly1, K L Chiu, S P Giblin

  • 1National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK. mrc61@cam.ac.uk

Nature Nanotechnology
|May 14, 2013
PubMed
Summary

Researchers developed a novel graphene single-electron pump operating at gigahertz frequencies. This breakthrough advances electrical metrology and quantum technologies, enabling precise current generation for future applications.

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Area of Science:

  • Quantum Metrology
  • Condensed Matter Physics
  • Materials Science

Background:

  • Single-electron pumps are crucial for redefining the ampere using the elementary charge.
  • Existing pumps have limitations in speed or theoretical accuracy.
  • Graphene offers unique electronic properties for advanced device fabrication.

Purpose of the Study:

  • To present a novel, monolithic, fixed-barrier single-electron pump constructed entirely from graphene.
  • To demonstrate gigahertz frequency operation for this graphene-based pump.
  • To explore the potential of graphene pumps in quantum metrology and other quantum technologies.

Main Methods:

  • Fabrication of a monolithic single-electron pump using graphene.
  • Characterization of pump performance at frequencies up to several gigahertz.
  • Theoretical analysis of error rates in gigahertz-frequency graphene pumps.

Main Results:

  • The graphene single-electron pump achieves gigahertz operating frequencies.
  • The device exhibits potential for high-accuracy quantized current generation.
  • The study paves the way for an all-graphene quantum metrological triangle.

Conclusions:

  • Graphene is a promising material for high-frequency single-electron pumps.
  • These pumps have significant implications for electrical metrology and quantum information processing.
  • Future applications include single-photon generation and quantum qubit readout.