Dissipationless transport in low density bilayer systems

Details Dissipationless transport in low density bilayer systems Dissipationless transport in low density bilayer systems

1999-08-17

arxiv.org/abs/cond-mat/9908251v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, no figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.139

In a bilayer electronic system the layer index may be viewed as the z-component of an isospin-1/2. An XY isospin-ordered ferromagnetic phase was observed in quantum Hall systems and is predicted to exist at zero magnetic field at low density. This phase is a superfluid for opposite currents in the two layers. At B=0 the system is gapless but superfluidity is not destroyed by weak disorder. In the quantum Hall case, weak disorder generates a random gauge field which probably does not destroy superfluidity. Experimental signatures include Coulomb drag and collective mode measurements.

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