Resistance Fluctuations in the Quantum Hall Regime

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Abstract

We have measured the low-temperature magnetoresistance of long (>50 mu m), narrow (similar to 1 mu m) quantum wires fabricated from a high-mobility two-dimensional electron gas. In the quantum Hall regime at high magnetic fields we observe that the Shubnikov-de Haas oscillations split into a series of aperiodic sharp peaks. Both the amplitude and sharpness of the peaks are strongly dependent on temperature below 1 K. We attribute the peaks to resonant tunneling between edge states through localized states in the bulk. The results are in quantitative agreement with the theoretical model of Jain and Kivelson.

Keyword(s)

breakdown; edge states; high magnetic-fields; phase; suppression; universal conductance fluctuations

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