Transport Properties in Bilayer Quantum Hall Systems in the Presence of a Topological Defect

Following a suggestion given in [1], we show how a bilayer Quantum Hall system at fillings $v = 1p+1$ can exhibit a point‐like topological defect in its edge state structure. Indeed our CFT theory for such a system, the Twisted Model (TM), gives rise in a natural way to such a feature in the twisted sector. Our results are in agreement with recent experimental findings which evidence the presence of a topological defect in the transport properties of the bilayer system.