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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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Presentation on theme: "Coulomb Drag in a Strongly Correlated Double Layer 2D Electron System Melinda Kellogg James Eisenstein Loren Pfeiffer Ken West."— Presentation transcript:

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

2 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

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

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

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

6 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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