1/f frequency fluctuations due to kinetic inductance in CoSi₂ microwave cavities

2024/03/13 by Weijun Zeng, Zeng, Weijun, Ilari Lilja +12
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Semiconductor Quantum Structures and Devices #Semiconductor materials and interfaces #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2403.08347

openalex publication_date 2024/03/13 · openalex created_date 2024/03/15 · openalex updated_date 2026/07/30

Abstract

Cobalt disilicide provides a promising nearly-epitaxial superconducting material on silicon, which is compatible with high-density integrated circuit technology. We have characterized CoSi₂ superconducting microwave cavities around 5.5 GHz for resonance frequency fluctuations at temperatures 10 - 200 mK. We found relatively weak fluctuations (δf/f)² following the spectral density A/f^γ , with A ≃ 6 × 10^-16 and γ slightly below 1 at an average number of photons of 10⁴; the noise decreased with measurement power as 1/P^1/2. We identify the noise as arising from kinetic inductance fluctuations and discuss possible origins of such fluctuations.

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