Journal
PHYSICAL REVIEW LETTERS
Volume 95, Issue 6, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.95.066808
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We have observed quantization of the diagonal resistance, R-xx, at the edges of several quantum Hall states. Each quantized R-xx value is close to the difference between the two adjacent Hall plateaus in the off-diagonal resistance, R-xy. Peaks in R-xx occur at different positions in positive and negative magnetic fields. Practically all R-xx features can be explained quantitatively by a 1%/cm electron density gradient. Therefore, R-xx is determined by R-xy and unrelated to the diagonal resistivity rho(xx). Our findings throw an unexpected light on the empirical resistivity rule for 2D systems.
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