TUNNELING BETWEEN HIGHLY CORRELATED 2D ELECTRON-SYSTEMS

Experiments on the tunneling between two parallel 2D electron gases at high magnetic fields are discussed. After reviewing the recent discov ery of a broad high field tunneling gap tied to the Fermi level, sever al new results are presented. These include studies of the detailed sh ape of the gap near onset and evidence of the fractional quantum Hall effect in the tunneling characteristics. Finally, we present data sugg esting that effects of Coulomb interactions on the tunneling may be se parable into two distinct regimes.