Microstructural and preliminary optical and microwave characterization of erbium doped CaMoO$_4$ thin films

• URL: http://arxiv.org/abs/2508.15122v1
• Date: Wed, 20 Aug 2025 23:10:06 GMT
• Title: Microstructural and preliminary optical and microwave characterization of erbium doped CaMoO$_4$ thin films
• Authors: Ignas Masiulionis, Bonnie Y. X. Lin, Sagar Kumar Seth, Gregory D. Grant, Wanda L. Lindquist, Sungjoon Kim, Junghwa Kim, Angel Yanguas-Gil, Jeffrey W. Elam, Jiefei Zhang, James M. LeBeau, David D. Awschalom, Supratik Guha,
• Abstract summary: This work explores erbium-doped calcium molybdate (CaMoO$_4$) thin films grown on silicon and yttria stabilized zirconia (YSZ) substrates as a potential solid state system for C-band.
• Score: 0.8242237634917229
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: This work explores erbium-doped calcium molybdate (CaMoO$_4$) thin films grown on silicon and yttria stabilized zirconia (YSZ) substrates, as a potential solid state system for C-band (utilizing the $\sim$1.5 $\mu$m Er$^{3+}$ 4f-4f transition) quantum emitters for quantum network applications. Through molecular beam epitaxial growth experiments and electron microscopy, X-ray diffraction and reflection electron diffraction studies, we identify an incorporation limited deposition regime that enables a 1:1 Ca:Mo ratio in the growing film leading to single phase CaMoO$_4$ formation that can be in-situ doped with Er (typically 2-100 ppm). We further show that growth on silicon substrates is single phase but polycrystalline in morphology; while growth on YSZ substrates leads to high-quality epitaxial single crystalline CaMoO$_4$ films. We perform preliminary optical and microwave characterization on the suspected $Y_1 - Z_1$ transition of 2 ppm, 200 nm epitaxial CaMoO$_4$ annealed thin films and extract an optical inhomogeneous linewidth of 9.1(1) GHz, an optical excited state lifetime of 6.7(2) ms, a spectral diffusion-limited homogeneous linewidth of 6.7(4) MHz, and an EPR linewidth of 1.10(2) GHz.

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