Record number :
Title of article :
Spectroscopic evidence of extended states in quantized Hall phase of weakly coupled GaAs/AlGaAs multi-layers
Author/Authors :
Y.A. Pusep، نويسنده , , F.E.G. Guimar?es، نويسنده , , H. Arakaki، نويسنده , , C.A. de Souza، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Pages :
From page :
To page :
Abstract :
The influence of the interlayer coupling on formation of the quantized Hall conductor phase at the filling factor ν=2 was studied in the multi-layer GaAs/AlGaAs heterostructures. The disorder broadened Gaussian photoluminescence line due to the localized electrons was found in the quantized Hall phase of the isolated multi-quantum well structure. On the other hand, the quantized Hall phase of the weakly coupled multi-layers emitted an unexpected asymmetrical line similar to that one observed in the metallic electron systems. We demonstrated that the observed asymmetry is caused by a partial population of the extended electron states formed in the quantized Hall conductor phase due to the interlayer percolation. A sharp decrease of the single-particle scattering time associated with these extended states was observed at the filling factor ν=2.
Keywords :
Quantum Hall effect , Multi-layers
Journal title :
Physica E Low-dimensional Systems and Nanostructures
Serial Year :
Link To Document :