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arXiv · 2012.10520

Stimulated emission depletion spectroscopy of color centers in hexagonal boron nitride

Ralph N. E. Malein·Prince Khatri·Andrew J. Ramsay·Isaac J. Luxmoore
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Abstract

We demonstrate the use of Stimulated Emission Depletion (STED) spectroscopy to map the electron-optical-phonon sideband of the ground state of the radiative transition of color centers in hexagonal boron nitride emitting at 2.0-2.2 eV, with in-plane linear polarization. The measurements are compared to Photoluminescence of Excitation (PLE) spectra, that maps the electron-optical-phonon sideband of the excited state. The main qualitative difference is a red-shift in the longitudinal optical phonon peak associated with $E_{1u}$ symmetry at the zone center. We argue that this is consistent with recent findings for a carbon-based line defect with admixture of energetically similar excited states.

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Ralph N. E. Malein, Prince Khatri, Andrew J. Ramsay, Isaac J. Luxmoore. 2020-12-18. Stimulated emission depletion spectroscopy of color centers in hexagonal boron nitride. https://doi.org/10.1021/acsphotonics.0c01917

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