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arXiv 2401.05089physics.app-phcond-mat.mes-hall
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晶圆级、CMOS兼容的石墨烯约瑟夫森场效应晶体管

Wafer-scale CMOS-compatible graphene Josephson field-effect transistors

Andrey A. Generalov, Klaara L. Viisanen, Jorden Senior, Bernardo R. Ferreira, Jian Ma, Mikko Möttönen, Mika Prunnila, Heorhii Bohuslavskyi

AI总结:

本文提出晶圆级CMOS兼容的石墨烯JoFET制备工艺,实现低接触电阻、顶栅可调临界电流和邻近诱导超导,为石墨烯集成量子电路奠定基础。

摘要:

静电可调的约瑟夫森场效应晶体管(JoFET)是量子电子学最受期待的构建模块之一。JoFET的应用范围涵盖参量放大器、超导量子比特以及多种集成超导电路。本文报道了采用晶圆级、与互补金属氧化物半导体(CMOS)兼容的工艺制备的石墨烯JoFET器件;该工艺基于化学气相沉积石墨烯的湿法转移、原子层沉积的Al₂O₃栅氧化层,以及蒸发制备的超导Ti/Al源极、漏极和栅极接触。通过将接触电阻优化至约170 Ωμm,我们在栅长为150–350 nm的不同JoFET沟道中观察到邻近效应诱导的超导性。这些约瑟夫森结器件表现出可由局部顶栅重复调控的临界电流I_C。本文的JoFET处于短扩散极限,在50 μm沟道宽度下,I_C最高可达约3 μA。总体而言,本文对兼容CMOS、基于二维材料的JoFET制备工艺的演示,是迈向基于石墨烯的集成量子电路的重要一步。

英文摘要:

Electrostatically tunable Josephson field-effect transistors (JoFETs) are one of the most desired building blocks of quantum electronics. JoFET applications range from parametric amplifiers and superconducting qubits to a variety of integrated superconducting circuits. Here, we report on graphene JoFET devices fabricated with wafer-scale complementary metal-oxide-semiconductor (CMOS) compatible processing based on wet transfer of chemical vapour deposited graphene, atomic-layer-deposited Al$_{2}$O$_{3}$ gate oxide, and evaporated superconducting Ti/Al source, drain, and gate contacts. By optimizing the contact resistance down to $\sim$ 170 $Ωμm$, we observe proximity-induced superconductivity in the JoFET channels with different gate lengths of 150 - 350 nm. The Josephson junction devices show reproducible critical current $I_{\text{C}}$ tunablity with the local top gate. Our JoFETs are in short diffusive limit with the $I_{\text{C}}$ reaching up to $\sim\,$3 $μA$ for a 50 $μm$ channel width. Overall, our demonstration of CMOS-compatible 2D-material-based JoFET fabrication process is an important step toward graphene-based integrated quantum circuits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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