期刊
NANO LETTERS
卷 22, 期 13, 页码 5137-5142出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00739
关键词
boron vacancy; hBN defect emitter; zero-phonon line; cavity-emitter coupling
类别
资金
- German Science Foundation (DFG) [FI 947/81, DI 2013/5-1, SPP-2244, EXS-2111, EXS-2089]
- Alexander v. Humboldt foundation
- Ion Beam Center (IBC) at HZDR
In this study, we measured the zero-phonon line (ZPL) wavelength of negatively charged boron vacancies (V-B(-)) in hexagonal boron nitride (hBN) by coupling hBN layer to a high-Q nanobeam cavity. We observed a pronounced intensity resonance when the wavelength of the cavity mode was tuned, indicating the coupling to V-B(-). Spatially resolved measurements showed a clear Purcell effect maximum at the midpoint of the nanobeam.
Negatively charged boron vacancies (V-B(-)) in hexagonal boron nitride (hBN) exhibit a broad emission spectrum due to strong electron-phonon coupling and Jahn-Teller mixing of electronic states. As such, the direct measurement of the zero-phonon line (ZPL) of V-B(-) has remained elusive. Here, we measure the room-temperature ZPL wavelength to be 773 +/- 2 nm by coupling the hBN layer to the high-Q nanobeam cavity. As the wavelength of cavity mode is tuned, we observe a pronounced intensity resonance, indicating the coupling to V-B(-). Our observations are consistent with the spatial redistribution of V-B(-) emission. Spatially resolved measurements show a clear Purcell effect maximum at the midpoint of the nanobeam, in accord with the optical field distribution of the cavity mode. Our results are in good agreement with theoretical calculations, opening the way to using V-B(-) as cavity spin-photon interfaces.
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