COULOMB-BLOCKADE IN 2-DIMENSIONAL ELECTRON-SYSTEMS IN A STRONG MAGNETIC-FIELD

We consider tunneling in a system of two parallel two-dimensional laye rs of electrons in the presence of a strong perpendicular magnetic fie ld. The tunneling current between the two layers is blockaded at low v oltages due to strong correlations in each subsystem. We calculate the current-voltage characteristics by modeling the two subsystems as Wig ner crystals, and find a current peak at a finite voltage. The peak is broadened by the excitation of collective modes of the Wigner crystal s. Our results are in a good quantitative agreement with recent experi ments.