Anomalous supercurrent and quantum interference in a DNA-assembled superconducting lattice

Self-assembled DNA nano-structures offer a pathway to fabricate quantum devices not achievable by conventional nano-fabrication techniques. In this work, we demonstrate a facile method to fabricate a three-dimensional network of nanoscale superconducting weak links by coating the DNA self-assembled cubic superlattice with aluminum. This is the first demonstration of a compact three-dimensional Josephson network. Electrical characterization reveals field-enhanced switching currents, previously linked with triplet superconductivity. We further observe field-asymmetric supercurrent quantum interference patterns. Such patterns have been observed in Josephson junctions constructed with topological insulators or semiconductors with large spin-orbit interactions. In our device no such physics is expected, as the transport is carried out by superconducting aluminum alone. We explain these results in terms of disorder in a network of Josephson junctions and disentangle the role of disorder from other material properties.