2021/01/25 by W. Liu, Z.-P. Li, Z. -P. Li +40
Materials Science · Physics and Astronomy · #Boron nitride #Condensed matter physics #Diamond and Carbon-based Materials Research #Graphene #Graphene research and applications #Hexagonal boron nitride #Materials science #Nanophotonics #Nanotechnology #Optoelectronics #Physics #Quantum and electron transport phenomena #Thermal #Thermodynamics #quant-ph
paper · pdf · doi:10.1021/acsphotonics.1c00320
published as ACS Photonics 8(2021) 1889-1895
openalex publication_date 2021/01/25 · openalex created_date 2021/07/19 · arxiv created 2021/09/23 · arxiv updated 2021/09/24 · openalex updated_date 2026/08/05
Two-dimensional hexagonal boron nitride (hBN) has attracted large attentions as platforms for realizations for integrated nanophotonics and collective effort has been focused on the spin defect centers. Here, the temperature dependence of the resonance spectrum in the range of 5-600 K is investigated. The zero-field splitting (ZFS) parameter D is found to decrease monotonicly with increasing temperature and can be described by Varshni empirical equation perfectly, while E almost does not change. We systematically study the differences among different hBN nanopowders and provide an evidence of edge effects on ODMR of VB- defects. Considering the proportional relation between D and reciprocal of lattice volume, the thermal expansion might be the dominant reason for energy-level shifts. We also demonstrate that the VB- defects still exist stably at least at 600 K. Moreover, we propose a scheme for detecting laser intensity using the VB- defects in hBN nanopowders, which is based on the obvious dependence of its D value on laser intensity. Our results are helpful to gain insight into the spin properties of VB- and for the realizations of miniaturized, integrated thermal sensor.