Entire Period Halving of Persistent Current in a Mesoscopic Double-Ring System

For the non-interacting electrons confined by a mesoscopic double-ring with a magnetic flux threading its center, we consider the problem of persistent current at zero and finite temperature. Furthermore, the tight-binding model is applied to give the expression of persistent current in this system. It is shown that in this double-ring system, the phenomena of entire period halving will occur.