Interlayer Tunneling in Counterflow Experiments on the Excitonic Condensate in Quantum Hall Bilayers

摘要

The effect of tunneling on the transport properties of quantum Hall double layers in the regime of the excitonic condensate at a total filling factor one is studied in counterflow experiments. If the tunnel current I is smaller than a critical I_C, tunneling is large and is effectively shorting the two layers. For I > I_C tunneling becomes negligible. Surprisingly, the transition between the two tunneling regimes has only a minor impact on the features of the filling-factor one state as observed in magnetotransport, but at currents exceeding I_C the resistance along the layers increases rapidly.