期刊
ACS NANO
卷 11, 期 3, 页码 3328-3336出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b00665
关键词
hexagonal boron nitride; single-photon source; fluorescent defect; single crystal; dipole lattice coupling; Huang-Rhys factor
类别
资金
- Army Research Office [W911NF-15-1-0589]
- NSF MRSEC [DMR-1120901]
- Research Council of Lithuania [M-ERA.NET-1/2015]
Hexagonal boron nitride (h-BN) is rapidly emerging as an attractive material for solid-state quantum engineering. Analogously to three-dimensional wide-band gap semiconductors such as diamond, h-BN hosts isolated defects exhibiting-visible fluorescence at room temperature, and the ability to position such quantum emitters within a two-dimensional material promises breakthrough advances in quantum sensing, photonics, and other quantum technologies. Critical to such applications is an understanding of the physics underlying h-BN's quantum emission. We report the creation and characterization of visible single-photon sources in suspended, single-crystal, h-BN films. With substrate interactions eliminated, we study the spectral, temporal, and spatial characteristics of the defects' optical emission. Theoretical analysis of the defects' spectra reveals similarities in vibronic coupling to h-BN phonon modes despite widely varying fluorescence wavelengths, and a statistical analysis of the polarized emission from many emitters throughout the same single-crystal flake uncovers a weak correlation between the optical dipole orientations of some defects and h-BN's primitive crystallographic axes, despite a clear misalignment for other dipoles. These measurements constrain possible defect models and, moreover, suggest that several classes of emitters can exist simultaneously throughout free-standing h-BN, whether they be different defects, different charge states of the same defect, or the result of strong local perturbations.
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