Unveiling the Zero-Phonon Line of the Boron Vacancy Center by Cavity-Enhanced Emission

Chenjiang Qian, Viviana Villafañe, Martin Schalk, G. V. Astakhov, Ulrich Kentsch, Manfred Helm, Pedro Soubelet, Nathan P. Wilson, Roberto Rizzato, Stephan Mohr, Alexander W. Holleitner, Dominik B. Bucher, Andreas V. Stier, Jonathan J. Finley

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Negatively charged boron vacancies (VB-) 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 VB-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 VB-. Our observations are consistent with the spatial redistribution of VB-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 VB-as cavity spin-photon interfaces.

Original languageEnglish
Pages (from-to)5137-5142
Number of pages6
JournalNano Letters
Volume22
Issue number13
DOIs
StatePublished - 13 Jul 2022

Keywords

  • boron vacancy
  • cavity-emitter coupling
  • hBN defect emitter
  • zero-phonon line

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