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The role of density imbalance in the νT=1 exciton condensate state for electron bilayer systems

MPS-Authors
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Wiersma,  R. D.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Lok,  J. G. S.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Dietsche,  W.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Nanostructuring Lab (Jürgen Weis), Max Planck Institute for Solid State Research, Max Planck Society;

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von Klitzing,  K.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Wiersma, R. D., Lok, J. G. S., Dietsche, W., von Klitzing, K., Schuh, D., & Wegscheider, W. (2006). The role of density imbalance in the νT=1 exciton condensate state for electron bilayer systems. physica status solidi (b), 243(14), 3643-3647.


Cite as: https://hdl.handle.net/21.11116/0000-000F-0007-9
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.