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

Autor:	Werner Wegscheider, J.G.S. Lok, Werner Dietsche, K. von Klitzing, Dieter Schuh, Rodney D. Wiersma
Rok vydání:	2006
Předmět:	Condensed Matter::Quantum Gases Electron density Phase boundary Condensed matter physics Chemistry Exciton Bilayer Phase (matter) Electron Electronic structure Condensed Matter Physics Electronic Optical and Magnetic Materials Phase diagram
Zdroj:	physica status solidi (b). 243:3643-3647
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.200642185
Popis:	We report on our experimental work involving the T = 1 exciton condensate in independently contacted bilayer two-dimensional electron systems. A phase diagram between the weakly coupled ( U = 1/2, L = 1/2) phase and the strongly coupled T = 1 phase is experimentally investigated as a function of d /B and electron density imbalance n ( [n L - n U]/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 drive,xx , where an unusual asymmetric behavior around zero imbalance occurs. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze:	OpenAIRE
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