Current-Phase Relations

The on-chip field coil on our scanning SQUID susceptometers allows us to directly measure the current-phase relation (CPR) of Josephson junctions embedded in mesoscopic superconducting rings.

Schematic of a CPR measurement where the Josephson junction consists of a semiconductor nanowire (dark gray) proximitized by superconducting aluminum (light gray). The phase across the junction is tuned by the field coil (blue), and the resulting supercurrent is measured by the pickup loop (red).

This page is currently under construction. See the following CPR publications for more details:

Current–phase relations of few-mode InAs nanowire Josephson junctions
Nature Physics 13, 1177–1181 (2017).
Nonsinusoidal Current-Phase Relationship in Josephson Junctions from the 3D Topological Insulator HgTe
Physical Review Letters 114, 066801 (2015).
Direct Measurement of Current-Phase Relations in Superconductor/Topological Insulator/Superconductor Junctions
Nano Letters, 2013, 13 (7), pp 3086–3092.