Phase Diagram for Quantum Hall Bilayers at $ν=1$

Details Phase Diagram for Quantum Hall Bilayers at $ν=1$ Phase Diagram for Quantum Hall Bilayers at $ν=1$

2003-05-06

arxiv.org/abs/cond-mat/0305096v1

Phys. Rev. Lett. 91, 116802 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages with 4 figures

Scientific paper

10.1103/PhysRevLett.91.116802

We present a phase diagram for a double quantum well bilayer electron gas in the quantum Hall regime at total filling factor $\nu =1$, based on exact numerical calculations of the topological Chern number matrix and the (inter-layer) superfluid density. We find three phases: a quantized Hall state with pseudo-spin superfluidity, a quantized Hall state with pseudo-spin ``gauge-glass'' order, and a decoupled composite Fermi liquid. Comparison with experiments provides a consistent explanation of the observed quantum Hall plateau, Hall drag plateau and vanishing Hall drag resistance, as well as the zero-bias conductance peak effect, and suggests some interesting points to pursue experimentally.

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