Phys.org December 27, 2019
Cooper pair splitting (CPS) can induce nonlocal correlation between two normal conductors that are coupled to a superconductor. An international team of researchers (Japan, China, Sweden) investigated CPS by using a Josephson junction of a gate-tunable ballistic InAs double nanowire. The measured switching current in the two nanowires was significantly larger than the sum of the switching current into the respective nanowires, indicating that interwire superconductivity is dominant compared with intrawire superconductivity. From its dependence on the number of propagating channels in the nanowires, the observed CPS was assigned to one-dimensional electron-electron interaction. The results will pave the way for the utilization of one-dimensional electron-electron interaction to reveal the physics of high-efficiency CPS and to engineer Majorana fermions in double nanowire systems via CPS…read more. Open Access TECHNICAL ARTICLE
A Josephson junction can split and recombine Cooper pairs of electrons as they travel through two nanowires. Credit: RIKEN