$h/e$ superconducting quantum interference through trivial edge states in InAs
Folkert K. de Vries, Tom Timmerman, Viacheslav P. Ostroukh, Jasper van, Veen, Arjan J. A. Beukman, Fanming Qu, Michael Wimmer, Binh-Minh Nguyen,, Andrey A. Kiselev, Wei Yi, Marko Sokolich, Michael J. Manfra, Charles M., Marcus, and Leo P. Kouwenhoven
TL;DR
This paper investigates trivial edge states in InAs Josephson junctions, revealing superconducting edge transport and an unusual $h/e$ SQUID signal likely caused by crossed Andreev states, advancing understanding of superconductivity in semiconductors.
Contribution
It demonstrates the presence of trivial edge states with superconducting transport and identifies an $h/e$ SQUID signal from crossed Andreev states in InAs junctions.
Findings
Superconducting edge transport indicated by SQUID pattern.
Observation of an $h/e$ SQUID signal from crossed Andreev states.
Trivial edge states can support superconductivity in InAs.
Abstract
Josephson junctions defined in strong spin orbit semiconductors are highly interesting for the search for topological systems. However, next to topological edge states that emerge in a sufficient magnetic field, trivial edge states can also occur. We study the trivial edge states with superconducting quantum interference measurements on non-topological InAs Josephson junctions. We observe a SQUID pattern, an indication of superconducting edge transport. Also, a remarkable SQUID signal is observed that, as we find, stems from crossed Andreev states.
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