Semiconductor Josephson Networks*

This talk will discuss recent experiments on Josephson junction arrays fabricated from epitaxial superconducting-semiconductor junctions. Of interested are comparisons of integer, half-integer, and irrational frustration (flux per plaquette), Berezinskii-Kosterlitz-Thouless transitions and deviations, coherence in the insulating phase, and the anomalous metal, a saturating low-temperature resistance. Transitions in these arrays can be controlled through the carrier density between superconducting islands. 

Research supported by a grant ((Project 43951) from the VILLUM FONDEN and the Danish National Research Foundation.