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arXiv · 2605.22303

Development and characterization of YBa$_2$Cu$_3$O$_{7-x}$/SrTiO$_3$ nanomembrane platform for silicon photonics integration

J. S. Madhira·G. Potemkin·B. Kardynal·D. Grützmacher·T. Schäpers·M. Lyatti
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Abstract

Integration of high-temperature superconducting devices with photonic circuits requires a material platform that preserves superconducting properties, provides interfacial heat transport control and optical accessibility. A YBa$_2$Cu$_3$O$_{7-x}$/SrTiO$_3$ (YBCO/STO) nanomembrane platform, enabling integration with SiO$_2$/Si substrates, is developed and characterized. Millimeter-scale ultra-thin YBCO films are grown on a STO/Sr$_{1.5}$Ca$_{1.5}$Al$_2$O$_6$ bilayer, released on a STO nanomembrane, and transferred onto SiO$_2$/Si substrates. X-ray diffraction confirms that crystallinity of STO and YBCO is preserved after transfer. Microbridges patterned from transferred YBCO films exhibit a critical temperature of 88.8 K and a critical current density of 6.8 MA/cm$^2$ at 77 K, comparable with those of YBCO films on STO substrates. Statistical measurements show a device fabrication yield of 93%, a critical-temperature variation of only 0.05 K, and 10% variation in critical current density, demonstrating excellent reproducibility. The thermal boundary conductance across the van der Waals interface between the YBCO/STO platform and the SiO$_2$/Si substrate is strongly reduced compared to that of epitaxial YBCO film on STO substrate. The reduced thermal coupling prolongs nonequilibrium states in superconducting nanostructures, which is advantageous for detector applications. These results establish ultra-thin YBCO films on optically transparent STO nanomembranes as a platform for integrating high-T$_c$ superconducting devices with silicon photonics.

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J. S. Madhira, G. Potemkin, B. Kardynal, D. Grützmacher, T. Schäpers, M. Lyatti. 2026-05-21. Development and characterization of YBa$_2$Cu$_3$O$_{7-x}$/SrTiO$_3$ nanomembrane platform for silicon photonics integration. https://arxiv.org/abs/2605.22303

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