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Bilayer Quantum Hall Systems at nuT = 1: Coulomb Drag and the Transition from Weak to Strong Interlayer Coupling

Kellogg, M. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2003) Bilayer Quantum Hall Systems at nuT = 1: Coulomb Drag and the Transition from Weak to Strong Interlayer Coupling. Physical Review Letters, 90 (24). Art. No. 246801. ISSN 0031-9007. doi:10.1103/PhysRevLett.90.246801.

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Measurements revealing anomalously large frictional drag at the transition between the weakly and strongly coupled regimes of a bilayer two-dimensional electron system at total Landau level filling factor nuT = 1 are reported. This result suggests the existence of fluctuations, either static or dynamic, near the phase boundary separating the quantized Hall state at small layer separations from the compressible state at larger separations. Interestingly, the anomalies in drag seem to persist to larger layer separations than does interlayer phase coherence as detected in tunneling.

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Additional Information:©2003 The American Physical Society (Received 22 November 2002; published 17 June 2003) We thank Ady Stern, Bertrand Halperin, Steven Simon, and Steven Girvin for helpful discussions and Ian Spielman for help with sample fabrication. This work was supported by the NSF under Grant No. DMR0070890 and the DOE under Grant No. DEFG03-99ER45766.
Subject Keywords:quantum Hall effect; two-dimensional electron gas; strongly correlated electron systems; Landau levels; interface states; fluctuations
Issue or Number:24
Record Number:CaltechAUTHORS:KELprl03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3926
Deposited By: Archive Administrator
Deposited On:19 Jul 2006
Last Modified:08 Nov 2021 20:13

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