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Related Concept Videos

Quantum Numbers02:43

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Single-electron charge sensing in self-assembled quantum dots.

Haruki Kiyama1, Alexander Korsch2, Naomi Nagai3

  • 1The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan. kiyama@sanken.osaka-u.ac.jp.

Scientific Reports
|September 20, 2018
PubMed
Summary
This summary is machine-generated.

We demonstrate single-electron charge sensing in self-assembled quantum dots. This breakthrough enables real-time detection of electron tunneling, advancing quantum technologies.

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Area of Science:

  • Quantum Technology
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Single-electron charge measurement is fundamental to quantum technologies like spin and photon detection.
  • Existing charge sensing is limited to gate-defined quantum dots, leaving self-assembled quantum dots unexplored.
  • Self-assembled quantum dots offer unique transport and optical properties.

Purpose of the Study:

  • To develop and demonstrate single-electron charge sensing in self-assembled quantum dots.
  • To enable electrical readout of quantum phenomena in these promising nanostructures.

Main Methods:

  • Fabrication of source and drain electrodes on adjacent self-assembled quantum dots.
  • Utilizing one dot as a charge sensor for the adjacent target dot.
  • Monitoring sensor dot current changes in response to electron addition/removal in the target dot.

Main Results:

  • Achieved significant sensor current changes corresponding to single-electron charge variations.
  • Demonstrated real-time detection of single-electron tunneling events.
  • Validated the capability of self-assembled quantum dots for sensitive charge sensing.

Conclusions:

  • Established a novel charge sensing technique for self-assembled quantum dots.
  • This method paves the way for integrating electrical readout with advanced quantum transport and optical applications.
  • Represents a key advancement for single-electron manipulation and quantum information processing.