Activated Transport in the individual Layers that form the νT=1 Exciton Condensate
R. D. Wiersma, J. G. S. Lok, S. Kraus, W. Dietsche, K. von Klitzing, D. Schuh, M. Bichler, H. -P. Tranitz, W. Wegscheider
Abstract
We observe the total filling factor νT=1 quantum Hall state in a bilayer two-dimensional electron system with virtually no tunnelling. We find thermally activated transport in the balanced system with a monotonic increase of the activation energy with decreasing d/B below 1.65. In the imbalanced system we find activated transport in each of the layers separately, yet the activation energies show a striking asymmetry around the balance point. This implies that the gap to charge-excitations in the individual layers is substantially different for positive and negative imbalance.
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