Coherent Control of Spin in Color Centers in Wide-Bandgap Semiconductors

Color centers in wide-bandgap semiconductors provide a promising platform for room-temperature quantum technologies due to their optical addressability and long-lived spin states. In this thesis, optical and spin properties of defect centers are investigated in two material systems: hexagonal boron nitride and pink diamond. Photoluminescence spectroscopy is used to characterize emission features of multiple hBN flakes under different excitation wavelengths and following helium implantation, revealing reproducible spectral features but no clear implantation-induced modifications. In parallel, optically detected magnetic resonance and time-domain measurements are performed on nitrogen-vacancy centers in pink diamond, demonstrating coherent spin control through Rabi oscillations. From these measurements, a transverse spin coherence time of T2 = (0.65 ± 0.22) µs is extracted. While the results do not allow definitive identification of all defect species or relaxation mechanisms, this...Show moreColor centers in wide-bandgap semiconductors provide a promising platform for room-temperature quantum technologies due to their optical addressability and long-lived spin states. In this thesis, optical and spin properties of defect centers are investigated in two material systems: hexagonal boron nitride and pink diamond. Photoluminescence spectroscopy is used to characterize emission features of multiple hBN flakes under different excitation wavelengths and following helium implantation, revealing reproducible spectral features but no clear implantation-induced modifications. In parallel, optically detected magnetic resonance and time-domain measurements are performed on nitrogen-vacancy centers in pink diamond, demonstrating coherent spin control through Rabi oscillations. From these measurements, a transverse spin coherence time of T2 = (0.65 ± 0.22) µs is extracted. While the results do not allow definitive identification of all defect species or relaxation mechanisms, this work establishes a consistent experimental and analytical framework for future studies of color centers in wide-bandgap semiconductors at ambient conditions.Show less

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Coherent Control of Spin in Color Centers in Wide-Bandgap Semiconductors