2022
DOI: 10.48550/arxiv.2210.00150
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Emitter-Optomechanical Interaction in Ultra-High-Q hBN Nanocavities

Abstract: We investigate the interaction between charged boron vacancies V − B in hBN and optomechanical modes in a nanobeam cavity using spatially resolved photoluminescence (PL) and Raman spectroscopy. V − B is a point defect emitter and the emission is dominated by phonon-assisted processes. As such, the V − B emission is intrinsically sensitive to, and interacts with local deformations such as lattice phonons and cavity optomechanical vibrations. We observe a pronounced spectral asymmetry of the high-Q (∼ 10 5 ) nan… Show more

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“…At zero magnetic field, the ± 1 j i states are degenerate but separated in energy from the 0 j i state due to a zero-field splitting (ZFS) of D ~3.47 GHz. The transition from the ground state to the excited state by green laser illumination (e.g., λ = 532 nm) is followed by a phonon-assisted radiative decay with broad photoluminescence (PL) peaking at ~850 nm 35,36 . A spin-statedependent relaxation path through inter-system crossing (ISC) leads to two important consequences: (1) the V B À defects can be optically initialized into the 0 j i state under ambient conditions; (2) the 0 j i and ± 1 j i states can be distinguished by their spin-state dependent PL (Fig.…”
Section: Characterization Of V à B Spin Propertiesmentioning
confidence: 99%
“…At zero magnetic field, the ± 1 j i states are degenerate but separated in energy from the 0 j i state due to a zero-field splitting (ZFS) of D ~3.47 GHz. The transition from the ground state to the excited state by green laser illumination (e.g., λ = 532 nm) is followed by a phonon-assisted radiative decay with broad photoluminescence (PL) peaking at ~850 nm 35,36 . A spin-statedependent relaxation path through inter-system crossing (ISC) leads to two important consequences: (1) the V B À defects can be optically initialized into the 0 j i state under ambient conditions; (2) the 0 j i and ± 1 j i states can be distinguished by their spin-state dependent PL (Fig.…”
Section: Characterization Of V à B Spin Propertiesmentioning
confidence: 99%