2022/02/16 by Daniel K. Angell, Angell, Daniel K., Shuo Li +19
Engineering · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Force Microscopy Techniques and Applications #Ion-surface interactions and analysis
paper · pdf · doi:10.48550/arxiv.2202.07879
openalex publication_date 2022/02/16 · openalex created_date 2022/05/05 · openalex updated_date 2026/07/28
Silicon-vacancy (SiV-) centers in diamond are promising candidates as sources of single-photons in quantum networks due to their minimal phonon coupling and narrow optical linewidths. Correlating SiV- emission with the defect's atomic-scale structure is important for controlling and optimizing quantum emission, but remains an outstanding challenge. Here, we use cathodoluminescence imaging in a scanning transmission electron microscope (STEM) to elucidate the structural sources of non-ideality in the SiV- emission from nanodiamonds with sub-nanometer-scale resolution. We show that different crystalline domains of a nanodiamond exhibit distinct zero-phonon line (ZPL) energies and differences in brightness, while near-surface SiV- emitters remain bright. We correlate these changes with local lattice expansion using 4D STEM and diffraction, and show that associated blue shifts from the ZPL are due to defect density heterogeneity, while red shifts are due to lattice distortions.