MANIFESTATION OF RESONANT-TUNNELING IN PERSISTENT CURRENT OSCILLATIONS

The persistent current for a one-dimensional ring with two tunnel barr iers is considered in the limit of weakly interacting electrons. In ad dition to a small off-resonance current, there are two kinds of resona nt behavior; (i) a current independent of the barrier transparency (tr ue resonance) and (ii) a current analogous to the one for a ring with only a single barrier (''semi resonance''). For a small barrier transp arency the ''semi resonance'' peaks are easily washed out by temperatu re whereas the true resonance peaks survive.