In-plane magnetotransport of resonantly coupled two-dimensional electron gases (2DEGșs) has been systematically studied in a (Formula presented) double-quantum-well system in which the top 2DEG is disconnected from all the Ohmic contacts to probe the bottom 2DEG selectively. When the filling factor is an integer, the tunneling between two 2DEGșs is found to be substantially suppressed, resulting in the sudden and twofold increase of the Hall resistance. It is also found that the minima of the magnetoresistance do not vanish, indicating the importance of tunnel interaction between nonequilibrium edge channels of two quantum-well layers.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 1996