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Abstract:
We report on our experimental work involving the nu(T) = I exciton
condensate in independently contacted bilayer two-dimensional electron
systems. A phase diagram between the weakly coupled (nu(U) = 1/2, nu(L)
= 1/2) phase and the strongly coupled nu(T) = 1 phase is experimentally
investigated as a function of d/l(B) and electron density imbalance
Delta n (equivalent to [n(L) - nU]/n(T)) using a drag current
configuration. For imbalanced electron layer densities, small
interlayer imbalances lead to strengthening of the excitonic phase.
Here density imbalance leads to a phase boundary in the drag layer
which is symmetric around zero imbalance. Surprisingly this behavior is
not seen for rho(drive,xx), where an unusual asymmetric behavior around
zero im-balance occurs. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA,
Weinheim.
