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arXiv · 2107.08042

Local Control of Supercurrent Density in Epitaxial Planar Josephson Junctions

Bassel H. Elfeky·Neda Lotfizadeh·William F. Schiela·William M. Strickland·Matthieu Dartiailh·Kasra Sardashti·Mehdi Hatefipour·Peng Yu·Natalia Pankratova·Hanho Lee·Vladimir E. Manucharyan·Javad Shabani
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Abstract

The critical current response to an applied out-of-plane magnetic field in a Josephson junction provides insight into the uniformity of its current distribution. In Josephson junctions with semiconducting weak links, the carrier density and, therefore the overall current distribution could be modified electrostatically via metallic gates. Here, we show local control of the current distribution in an epitaxial Al-InAs Josephson junction equipped with five mini-gates. We demonstrate that not only can the junction width be electrostatically defined but also we can locally adjust the current profile to form superconducting quantum interference devices. Our studies show enhanced edge conduction in such long junctions, which can be eliminated by mini-gates to create a uniform current distribution.

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Bassel H. Elfeky, Neda Lotfizadeh, William F. Schiela, William M. Strickland, Matthieu Dartiailh, Kasra Sardashti, Mehdi Hatefipour, Peng Yu, Natalia Pankratova, Hanho Lee, Vladimir E. Manucharyan, Javad Shabani. 2021-07-16. Local Control of Supercurrent Density in Epitaxial Planar Josephson Junctions. https://doi.org/10.1021/acs.nanolett.1c02771

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