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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
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All objects we see around us consist of atoms, which combine to form molecules. The lightest element in the universe is hydrogen, and a hydrogen atom consists of a positively charged proton and a negatively charged electron. The magnitude of charge that a proton and an electron carry are the same, and it is the fundamental unit of charge. In SI units, it is 1.602 times 10-19 coulomb.
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The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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One-Lead Single-Electron Source with Charging Energy.

Sung Un Cho1, Wanki Park1, Bum-Kyu Kim2

  • 1Department of Physics & Center for Quantum Coherence in Condensed Matter, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.

Nano Letters
|November 28, 2022
PubMed
Summary
This summary is machine-generated.

We developed a novel single-electron source using quantum dots (QDs) that emits quantized currents of electrons and holes. This breakthrough enables new possibilities in quantum optics and electron devices.

Keywords:
electron quantum opticselectron−hole splitterparallel electron pumpingsingle-electron source

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Area of Science:

  • Quantum physics
  • Mesoscopic physics
  • Solid-state physics

Background:

  • Single-electron sources are crucial for quantum optics.
  • Existing sources have limitations in functionality and control.

Purpose of the Study:

  • To develop a novel single-electron source with enhanced functionalities.
  • To demonstrate controlled emission of electrons and holes.
  • To explore applications in quantum electron devices.

Main Methods:

  • Utilizing a quantum dot (QD) coupled to a single lead.
  • Employing an AC radiofrequency (rf) drive for particle emission.
  • Leveraging significant charging energy within the QD.
  • Implementing a potential barrier for particle separation.
  • Operating the source in a series double quantum dot geometry.

Main Results:

  • Successful successive emission of cotraveling holes and electrons.
  • Demonstration of a rectified quantized current.
  • Observation of quantized triangular islands in the pump map, matching theoretical predictions.
  • Successful parallel electron pumping using a common gate in a double QD setup.

Conclusions:

  • The developed single-electron source offers unique functionalities.
  • The device enables precise control over electron and hole emission.
  • This technology paves the way for advanced quantum electron devices and quantum optics.