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The Quantum-Mechanical Model of an Atom02:45

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Voltage-controlled quantum light from an atomically thin semiconductor.

Chitraleema Chakraborty1, Laura Kinnischtzke2, Kenneth M Goodfellow3

  • 1Materials Science, University of Rochester, Rochester, New York 14627, USA.

Nature Nanotechnology
|May 5, 2015
PubMed
Summary
This summary is machine-generated.

Researchers engineered quantum dots within atomically thin tungsten diselenide (WSe2) for novel optoelectronics. These WSe2 quantum dots emit controllable single photons, paving the way for quantum information processing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Semiconductor defects are crucial for optoelectronic device functionality.
  • Quantum dots and atomically thin materials are key areas of research for quantum technologies.
  • Tungsten diselenide (WSe2) is an atomically thin semiconductor with potential for novel applications.

Purpose of the Study:

  • To investigate WSe2 as a host material for quantum dot-like defects.
  • To explore the properties of single-photon emitters in WSe2.
  • To demonstrate the tunability of these emitters using external fields.

Main Methods:

  • Fabrication of quantum dot-like defects in atomically thin WSe2.
  • Optical characterization of single-photon emission properties.
  • Application of external electric and magnetic fields to tune emission.

Main Results:

  • Demonstrated WSe2 as a viable host for quantum dot-like defects.
  • Observed single-photon emission from these WSe2 quantum dots.
  • Showcased control over emission properties via external d.c. electric and magnetic fields.
  • Measured excited-state lifetimes of ~1 ns and large excitonic g-factors (~10).

Conclusions:

  • Atomically thin WSe2 can host optically active quantum dots.
  • These WSe2 quantum dots offer a new platform for integrated quantum photonics and quantum information processing.
  • The system provides opportunities for exploring fundamental condensed-matter physics.