We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.
|Publication status||Published - 1994|
|Event||International Conference on Modulated Semiconductor Structures - GARMISCH PARTENKIR, GERMANY|
Duration: 1 Jan 1993 → …
Conference number: 6th
|Conference||International Conference on Modulated Semiconductor Structures|
|City||GARMISCH PARTENKIR, GERMANY|
|Period||01/01/1993 → …|