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Zero-bias conductance anomaly in bilayer quantum Hall systems
Bilayer quantum Hall system at total filling factor shows a rich
variety of broken symmetry ground states because of the competition between the
interlayer and intralayer Coulomb interactions. When the layers are
sufficiently close, a bilayer system develops spontaneous interlayer
phase-coherence that manifests itself through a spectacular enhancement of the
zero-bias interlayer tunneling conductance. We present a theory of this
tunneling conductance anomaly, and show that the zero-bias conductance is
proportional to the square of the {\it quasiparticle} tunneling amplitude.Comment: 3 pages, 1 figure. To appear in the PPHMF-IV conference proceedings.
(For more details, see cond-mat/0103454) New version contains two added
reference
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