Related papers: Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$

Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$_4$ at milliKelvin temperatures

URL: http://arxiv.org/abs/2605.18208v1
Date: Mon, 18 May 2026 10:54:33 GMT
Title: Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$_4$ at milliKelvin temperatures
Abstract summary: We study spin-lattice relaxation times of electron spins in Er$3+$:CaWO$_4$ at millikelvin temperature.<n>At large magnetic field supporting strong phonon-emission rates, we observe a noticeable increase in relaxation times with increasing spin-excitations.<n>These observations are typical of a phonon-bottlenecked spin relaxation, and have implications for quantum technologies that exploit rare-earth spin ensembles as coherent resources.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We study spin-lattice relaxation times of electron spins in Er$^{3+}$:CaWO$_4$ at millikelvin temperature, detected via their coupling to a low-mode volume superconducting resonator. At large magnetic field supporting strong phonon-emission rates, we observe a noticeable increase in relaxation times with increasing spin-excitations, which exhibit a unique $[\tanh (\hbar ω_0/k_\text{B} T)]^2$ temperature dependence. These observations are typical of a phonon-bottlenecked spin relaxation, and have implications for quantum technologies that exploit rare-earth spin ensembles as coherent resources.

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