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Published on: October 12, 2019
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Decoherence of V spin defects in monoisotopic hexagonal boron nitride
A Haykal1, R Tanos1, N Minotto1
1Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France.
Nature Communications
|July 27, 2022
Summary
Spin defects in hexagonal boron nitride (hBN) show improved coherence with 10B enrichment. Identifying dark impurities enhances understanding for quantum sensing applications.
Area of Science:
- Quantum Information Science
- Materials Science
- Condensed Matter Physics
Background:
- Spin defects in hexagonal boron nitride (hBN) are key for 2D quantum sensing.
- Understanding their properties is crucial for developing advanced quantum technologies.
Purpose of the Study:
- Investigate isotope-dependent properties of a specific spin defect in hBN.
- Characterize its photoluminescence and spin coherence.
- Identify decoherence sources for improved quantum sensing.
Main Methods:
- Utilized hBN crystals isotopically enriched with Boron-10 (10B) or Boron-11 (11B).
- Analyzed hyperfine structure and spin coherence properties.
- Employed numerical simulations (cluster correlation expansion) and cross-relaxation spectroscopy.
Main Results:
- Confirmed the spin defect as the negatively charged boron-vacancy center (BV⁻).
- Observed slightly improved spin coherence in 10B-enriched hBN.
- Numerical simulations highlighted the significance of the hyperfine Fermi contact term.
- Identified dark electron spin impurities as a decoherence source.
Conclusions:
- Isotopic enrichment of hBN impacts spin defect properties, with 10B showing enhanced coherence.
- Understanding hyperfine interactions is vital for predicting defect coherence times.
- Mitigating decoherence from impurities is essential for robust hBN-based quantum sensors.
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