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Coulomb Drag in a Strongly Correlated Double Layer 2D Electron System Melinda Kellogg James Eisenstein Loren Pfeiffer Ken West

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I e-e- V e-e- e-e- e-e- GaAs 180Å99Å180Å ~ 10 6 cm 2 /Vs n layer = 5.3 x10 10 cm -2 Coulomb Drag Al 0.9 Ga 0.1 As

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Bilayer QHE Phase Diagram Murphy et al., 1994 Tunneling d __ l

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Temperature Dependence in Zero Field Deviation from quadratic behavior -- no phonon peak

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Kim, Nayak, Demler & Das Sarma 2000 Bonesteel, McDonald, Ussishkin & Stern, 1998 Above T c, Pairing Fluctuations

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We have discovered an enhancement in the drag resistivity at total = 1. This enhancement appears well above the bilayer QHE phase boundary. This enhancement persists when the layer densities are unbalanced.

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