Breakdown of Counterflow Superfluidity in a Disordered Quantum Hall Bilayer
Spatial distribution of tunneling currents (left column) and interlayer voltages (right column), in a lattice model of 200 × 20 sites, with current injection at the two lower corners. The injected counterflow currents are , 30, 45, 60 for the four pairs of plots. Dark colours, left column: high current. Dark colours, right column: low voltage. . Results are averaged over 500 realizations; tunneling currents are summed over blocks of sites.