h/e Superconducting Quantum Interference through Trivial Edge States in InAs

Phys Rev Lett. 2018 Jan 26;120(4):047702. doi: 10.1103/PhysRevLett.120.047702.

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 nontopological InAs Josephson junctions. We observe a SQUID pattern, an indication of superconducting edge transport. Also, a remarkable h/e SQUID signal is observed that, as we find, stems from crossed Andreev states.