Presentation on theme: "Coulomb Drag in a Strongly Correlated Double Layer 2D Electron System"— Presentation transcript:
1 Coulomb Drag in a Strongly Correlated Double Layer 2D Electron System Melinda KelloggJames EisensteinLoren PfeifferKen West
2 Coulomb Drag V I e- e- e- e- Al0.9Ga0.1As nlayer = 5.3 x1010 cm-2 ~ 106 cm2/V•sGaAsGaAs180Å99Å180Å
3 Bilayer QHE Phase Diagram __dlTunnelingMurphy et al., 1994
4 Temperature Dependence in Zero Field Deviation from quadratic behavior -- no phonon peak
5 Above Tc, Pairing Fluctuations Kim, Nayak, Demler & Das Sarma 2000Bonesteel, McDonald,Above Tc, Pairing FluctuationsUssishkin & Stern, 1998
6 Summary the drag resistivity at ntotal = 1. We have discovered an enhancement inthe drag resistivity at ntotal = 1.This enhancement appears well above thebilayer QHE phase boundary.This enhancement persists when thelayer densities are unbalanced.