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Quantum Numbers02:43

Quantum Numbers

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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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Quantum Emitters in Hexagonal Boron Nitride Have Spectrally Tunable Quantum Efficiency.

Andreas W Schell1, Mikael Svedendahl1, Romain Quidant1,2

  • 1ICFO-Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860, Castelldefels (Barcelona), Spain.

Advanced Materials (Deerfield Beach, Fla.)
|February 24, 2018
PubMed
Summary

Matching excitation wavelength to novel hexagonal boron nitride quantum emitters is key for bright, efficient single-photon emission. This finding reveals complex emitter properties, crucial for quantum optics and biology applications.

Keywords:
2D materialshexagonal boron nitridequantum efficiencysolid-state quantum emitters

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Materials science

Background:

  • Novel solid-state quantum emitters are crucial for quantum optics and biology.
  • Defects in hexagonal boron nitride (hBN) exhibit desirable properties like narrow emission lines and photostability.

Purpose of the Study:

  • Investigate the dependence of hBN quantum emitter emission on excitation wavelength.
  • Understand the complex internal level schemes of these emitters.
  • Develop methods for distinguishing emitters spatially and via photon correlations.

Main Methods:

  • Studied the photoluminescence properties of hBN quantum emitters.
  • Analyzed the relationship between excitation wavelength and emission intensity/efficiency.
  • Characterized emitter behavior using photon correlation measurements.

Main Results:

  • Achieving bright single-photon emission with high quantum efficiency requires precise matching of excitation wavelength to the specific emitter.
  • The emission behavior indicates complex, non-simple (two or three-level) internal energy level schemes.
  • Excitation-dependent studies provide insights into the emitters' internal structure.

Conclusions:

  • The excitation wavelength is a critical parameter for optimizing hBN quantum emitter performance.
  • The complex level schemes necessitate tailored excitation strategies.
  • This work demonstrates a method to differentiate and characterize individual quantum emitters.