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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.45: Poster

Dienstag, 18. März 2025, 18:00–20:00, P1

Multi-Frequency ODMR applied to Boron Vacancy Spin Defects of hBN — •Lucas Schreiber, Selin Steinicke, Paul Konrad, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics 6, University of Würzburg, 97074 Würzburg, Germany

Spin defects in hexagonal boron nitride (hBN) present a multitude of potential applications in the fields of quantum sensing and quantum information technology. Especially, the negatively charged boron vacancy defect can interact with the nuclear spins of its surrounding nitrogen atoms, thereby giving rise to hyperfine interactions. In this study, the spin defect was analyzed using optically detected magnetic resonance (ODMR) spectroscopy, wherein the spin sublevels are controlled by microwave pulses. In contrast to previous studies, the coherent microwave pulses employed in this work simultaneously utilize the multiple resonance frequencies of the hyperfine splitting. We therefore implement a multi-resonance technique for enhanced contrast and exploitation of the spin system. For an accurate and quantitative comparison with conventional ODMR, we derived a value for the contrast, allowing for a direct comparison of the hyperfine interaction on the spin defect. This approach aims at enhancing the optical detection of resonant excitation of the spin defect and facilitating coherent control experiments in future studies.

Keywords: hBN; Boron Vacancy; ODMR; Coherent Control; Quantum Sensing