Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-08-24
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 4 figures, paper of the invited talk at Semi-Mag 17, Wuerzburg, Germany
Scientific paper
10.1142/S0217979207042847
We summarize the screening theory of the integer quantized Hall effect (IQHE) and emphasize its two key mechanisms: first, the existence, in certain magnetic field intervals, of incompressible strips, with integer values of the local filling factor and quantized values of longitudinal and Hall resistivity, and second, the confinement of an imposed dissipative current to these strips, leading to the quantization of the global resistances. We demonstrate that, without any localization assumption, this theory explains the enormous experimental reproducibility of the quantized resistance values, as well as experimental results on the potential distribution in narrow Hall bars. We further demonstrate that inclusion of long-range potential fluctuations allows to apply the theory to wider Hall bars, and can lead to a broadening of the quantum Hall plateaus, whereas short-range disorder tends to narrow the plateaus.
Gerhardts Rolf R.
Siddiki Afif
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