Related papers: Temperature-Dependent Emission Spectroscopy of Quantum Emitters in Hexagonal Boron Nitride

Temperature-Dependent Emission Spectroscopy of Quantum Emitters in Hexagonal Boron Nitride

URL: http://arxiv.org/abs/2507.06783v2
Date: Mon, 14 Jul 2025 14:30:46 GMT
Title: Temperature-Dependent Emission Spectroscopy of Quantum Emitters in Hexagonal Boron Nitride
Authors: Mouli Hazra, Manuel Rieger, Anand Kumar, Mohammad N. Mishuk, Chanaprom Cholsuk, Kabilan Sripathy, Viviana Villafañe, Kai Müller, Jonathan J. Finley, Tobias Vogl,
Abstract summary: In this work, we extend the study of yellow emitters to cryogenic temperatures.<n>We identify a defect emission centered around 547.5 nm with high brightness and excellent photostability.<n>These observations deepen our understanding of the nature of the emitters, opening new avenues for precise tuning of quantum light sources.
Score: 32.95855018855191
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Color centers in hexagonal boron nitride (hBN) have attracted significant interest due to their potential applications in future optical quantum technologies. For most applications, scalable on-demand fabrication is a key requirement. Recent advances using localized electron irradiation have demonstrated near-identical emitters in the blue and yellow spectral regions. While the blue emitters have been demonstrated in cryogenic temperatures, the yellow emitters remain uncharacterized under such conditions. In this work, we therefore extended the study of yellow emitters to cryogenic temperatures. Initially, multiple spectral features were observed, prompting a systematic investigation that led to the identification of a defect emission centered around 547.5 nm with high brightness and excellent photostability. By tuning the excitation wavelength, we are able to distinguish Raman scattering peaks from the emitter emission. Further analysis of the vibronic emissions allowed us to identify an optical phonon mode, whose contribution becomes increasingly dominant at elevated temperatures. Photoluminescence excitation spectroscopy (PLE) reveals excitation through this phonon mode enhances the emission by almost 5-fold in cryogenic temperature. Temperature-dependent studies further elucidate the role of phonons in the emission process. These observations deepen our understanding of the nature of the emitters, opening new avenues for precise tuning of quantum light sources.

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