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Optically Active Spin Defects in Few-Layer Thick Hexagonal Boron Nitride.

A Durand1, T Clua-Provost1, F Fabre1

  • 1Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France.

Physical Review Letters
|September 29, 2023
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Summary
This summary is machine-generated.

Optically active spin defects in hexagonal boron nitride (hBN) offer new possibilities for quantum sensing. Researchers demonstrated optical detection of boron vacancy centers (V_{B}^{-}) in ultrathin hBN, crucial for developing advanced quantum technologies.

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Area of Science:

  • Quantum Science and Technology
  • Materials Science
  • Nanotechnology

Background:

  • Optically active spin defects in hexagonal boron nitride (hBN) are key for 2D quantum sensing.
  • Proximity to the sample is crucial for sensing efficiency, but surface effects can destabilize defects.

Purpose of the Study:

  • To demonstrate optical detection of electron spin resonance frequencies of boron vacancy centers (V_{B}^{-}) in few-atomic-layer hBN.
  • To analyze how hBN thickness affects V_{B}^{-} spin properties, including zero-field splitting, spin polarization, and relaxation times.

Main Methods:

  • Optical detection of electron spin resonance (ESR) frequencies.
  • Investigation of few-atomic-layer thick hBN flakes.
  • Analysis of spin properties (zero-field splitting, spin polarization rate, longitudinal spin relaxation time) as a function of hBN thickness.

Main Results:

  • Successful optical detection of V_{B}^{-} ESR frequencies in ultrathin hBN flakes.
  • Demonstrated stability of spin defects despite nanoscale proximity to the crystal surface.
  • Characterized variations in zero-field splitting, spin polarization rate, and spin relaxation time with hBN thickness.

Conclusions:

  • Ultrathin hBN flakes host stable and optically detectable V_{B}^{-} spin defects.
  • Understanding thickness-dependent spin properties is vital for optimizing quantum sensing applications.
  • These findings pave the way for novel foil-based quantum sensing technologies.