Magnetoresistance anomalies at level crossing in double layer quantum Hall systems

We have investigated magnetotransport behavior of a double quantum well system with weak interlayer tunneling. The scaling behavior of the localization property for the Landau levels associated with either layer is in agreement with earlier reports. For the case of Landau level coincidence between the two layers, an anomalous value of the exponent κ≈0.50 is observed. We have observed a peculiar resistance peak at View the MathML source for which the corresponding Hall resistance remains unchanged on both sides of the resistance peak. Hysteretic transition has been found in the region of crossing of the LLs originating from different layers.