Quantum Hall Exciton Condensation at Full Spin Polarization

Details Quantum Hall Exciton Condensation at Full Spin Polarization Quantum Hall Exciton Condensation at Full Spin Polarization

2009-11-12

arxiv.org/abs/0911.2461v1

Phys. Rev. Lett. 104, 016801 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 eps figures

Scientific paper

10.1103/PhysRevLett.104.016801

Using Coulomb drag as a probe, we explore the excitonic phase transition in quantum Hall bilayers at nu=1 as a function of Zeeman energy, E_Z. The critical layer separation d/l 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.

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