Finck, A. D. K. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2010) Quantum Hall Exciton Condensation at Full Spin Polarization. Physical Review Letters, 104 (1). Art. No. 016801 . ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20100217-093146277
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Using Coulomb drag as a probe, we explore the excitonic phase transition in quantum Hall bilayers at ν_T = 1 as a function of Zeeman energy E_Z. The critical layer separation (d/ℓ)_c for exciton condensation initially increases rapidly with E_Z, but then reaches a maximum and begins a gentle decline. At high E_Z, where both the excitonic phase at small d/ℓ and the compressible phase at large d/ℓ are fully spin polarized, we find that the width of the transition, as a function of d/ℓ, is much larger than at small E_Z and persists in the limit of zero temperature. We discuss these results in the context of two models in which the system contains a mixture of the two fluids.
|Additional Information:||© 2010 The American Physical Society. Received 12 November 2009; published 4 January 2010. We thank Allan MacDonald, Gil Refael, Steve Simon, Ady Stern, and Yue Zou for helpful discussions. This work was supported via NSF grant DMR-0552270.|
|Classification Code:||PACS: 73.43.Nq, 71.35.Lk.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||19 Feb 2010 17:49|
|Last Modified:||26 Dec 2012 11:46|
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