Exploring the properties of theVB-defect in hBN: optical spin polarization, Rabi oscillations, and coherent nuclei modulation.

Optically active point defects in semiconductors have received great attention in the field of solid-state quantum technologies. Hexagonal boron nitride, with an ultra-wide band gapEg= 6 eV, containing a negatively charged boron vacancy (VB-) with unique spin, optical, and coherent properties presents a new two-dimensional platform for the implementation of quantum technologies. This work establishes the value ofVB-spin polarization under optical pumping with= 532 nm laser using high-frequency (= 94 GHz) electron paramagnetic resonance (EPR) spectroscopy.

Diffusion Anisotropy of Gaseous Helium-3 in Ordered Aerogels at Low Temperatures.

We report on the first observation of diffusion anisotropy of gaseous helium-3 entrapped in ordered aerogels at 4.2 K. The origins of He diffusion anisotropy in aerogels of different porosity are discussed.

Coherence times and Rabi oscillations in CaWO₄:Cr(5+) crystal.

The coherence times of dopant pentavalent chromium ions in CaWO₄ single crystal (0.0006at.% Cr(5+)) were investigated both theoretically and experimentally.