Author

Achutha Kumar

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Preprint Sep 2026

Electron paramagnetic resonance of Dy${^3+}$-doped CaWO$_4$: spin Hamiltonian, crystal-field analysis, and linear electric field effect

We report an electron paramagnetic resonance (EPR) study of Dy${^3+}$ in CaWO$_4$ single crystals spanning dopant concentrations from 80~ppb to 247~ppm. The $g$ factors of the ground Kramers doublet at the $S_4$ point-group site, $g_\parallel = 7.22 \pm 0.01$ and $g_\perp = 5.45 \pm 0.01$, and the hyperfine constants o...

Achutha Kumar, Larissa Aboudem-Joumessi, R. Dassonneville et al. · 0 citations

#diffusion models Preprint Sep 2026

Strongly anisotropic non-Kramers electron spin as a quantum coherence probe of angular fluctuations

Strongly anisotropic non-Kramers rare-earth ions combine giant longitudinal g-factors with a vanishing transverse component imposed by time-reversal symmetry, a combination that makes their spin transitions exquisitely sensitive to the orientation of the applied magnetic field. We show that this sensitivity carries a d...

Achutha Kumar, R. Dassonneville, Guillaume Gerbaud et al. · 0 citations