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Published January 8, 2010 | Published + Submitted
Journal Article Open

Quantum Hall Exciton Condensation at Full Spin Polarization

Abstract

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.

Attached Files

Published - Finck2010p7055Phys_Rev_Lett.pdf

Submitted - 0911.2461.pdf

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