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• W2912477747 abstract "The current state-of-the-art approach for superconductor-insulator-superconductor (SIS) junction fabrication is based on magnetron sputtering and the Gurvitch Al overlayer trilayer process, where an Al overlayer is deposited onto the Nb base electrode in order to subsequently grow a critical ~1-nm AlO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</sub> or AlN tunnel barrier. While the switch from AlO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</sub> to AlN barriers has significantly increased the achievable critical current density, and significant research has been performed to understand and optimize inductively coupled plasma AlN growth, the use of Nb electrodes provides an upper limit to the frequency range for low-noise operation when employed in terahertz (THz) mixer applications and has led to the study and use of alternative materials with higher transition temperatures (T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> ) such as NbN and NbTiN. The Nb electrodes also impose stringent cooling requirements; replacement of both electrodes with higher T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> materials can increase the required device operating temperature to 10 K, thus reducing the power consumption of the refrigeration system, a building block for the realization of more energy efficient superconducting computing systems, such as those based on single-flux-quantum logic. In this work, we have departed from conventional SIS material growth techniques through the use of an alternative material deposition technology-reactive bias target ion beam deposition (RBTIBD)-that offers unique capabilities to tailor materials and interfaces. Using RBTIBD technology, we have realized the first ever NbTiN/AlN/NbTiN SIS junctions with highest yet reported sum-gap voltages exceeding 5.0 mV, potentially extending the theoretical limit of low-loss SIS mixing applications beyond 1.2 THz and relaxing the cooling requirements for superconducting device applications." @default.
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• W2912477747 date "2019-09-01" @default.
• W2912477747 modified "2023-09-23" @default.
• W2912477747 title "NbTiN/AlN/NbTiN SIS Junctions Realized by Reactive Bias Target Ion Beam Deposition" @default.
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• W2912477747 doi "https://doi.org/10.1109/tasc.2018.2884967" @default.
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