Hybrid superinductance with Al/InAs

• URL: http://arxiv.org/abs/2601.10023v1
• Date: Thu, 15 Jan 2026 03:14:49 GMT
• Title: Hybrid superinductance with Al/InAs
• Abstract summary: We report microwave spectroscopy of Josephson junctions chains made from an epitaxial Al/InAs heterostructure.<n>The chains exhibit superinductance, with characteristic wave impedance exceeding $R_Q = hbar/ (2e)2$.<n>The planar nature of the junctions results in a large plasma frequency, with no measurable deviations from ideal dispersion up to $12mathrmGHz$.
• Score: 0.5235143203977018
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report microwave spectroscopy of Josephson junctions chains made from an epitaxial Al/InAs heterostructure. The chains exhibit superinductance, with characteristic wave impedance exceeding $R_{Q} = \hbar/(2e)^{2}$. The planar nature of the junctions results in a large plasma frequency, with no measurable deviations from ideal dispersion up to $12~\mathrm{GHz}$. Internal quality factors decrease sharply with frequency, which we describe with a simple loss model. The possibility of a loss mechanism intrinsic to the superconductor-semiconductor junction is considered.

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