Observation of Quantized Hall Drag in a Strongly Correlated Bilayer Electron System

Observation of quantized Hall drag in a strongly correlated bilayer electron system.

The frictional drag between parallel two-dimensional electron systems has been measured in a regime of strong interlayer correlations. When the bilayer system enters the excitonic quantized Hall state at total Landau level filling factor nu(T) = 1, the longitudinal component of the drag vanishes but a strong Hall component develops. The Hall drag resistance is observed to be accurately quantize...

Spin transition in strongly correlated bilayer two-dimensional electron systems.

Using a combination of heat pulse and nuclear magnetic resonance techniques, we demonstrate that the phase boundary separating the interlayer phase coherent quantum Hall effect at nu(T) = 1 in bilayer electron gases from the weakly coupled compressible phase depends upon the spin polarization of the nuclei in the host semiconductor crystal. Our results strongly suggest that, contrary to the usu...

Nonequilibrium Quantum Breakdown in a Strongly Correlated Electron System

During the past decades, there has been an increasing fascination and surprises with diverse quantum many-body effects. With the magical touch of interaction a simple electron system may assume insulating, metallic, magnetic or superconducting states according as the control parameters are changed. Strongly correlated electron systems, as exemplified by the high-Tc superconductors and their hos...

Strongly correlated electron systems.

Strongly correlated electron systems.