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  • Title: Phase diagram for quantum hall bilayers at nu=1.
    Author: Sheng DN, Balents L, Wang Z.
    Journal: Phys Rev Lett; 2003 Sep 12; 91(11):116802. PubMed ID: 14525450.
    Abstract:
    We present a phase diagram for a double quantum well bilayer electron gas in the quantum Hall regime at a total filling factor nu=1, based on exact numerical calculations of the topological Chern number matrix and the (interlayer) superfluid density. We find three phases: a quantized Hall state with pseudospin superfluidity, a quantized Hall state with pseudospin "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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