Abstract
We present a theory of the Hall effect in a quantum dot coupled to Hall and current leads by narrow constrictions. A magnetic-diffraction effect is described which results in a series of deep minima in the Hall resistance persisting temperatures T>1 K, robustness that is unique among mesoscopic quantum interference phenomena. At higher T, phase-breaking casues an anomalous ‘‘last’’ Hall plateau at =h/4 and, at higher B, a plateau near the single-mode quantum Hall value =h/2. We explain the surprising behavior of the Hall resonances observed by Ford et al. (preceding paper) in quantum-wire junctions.
- Received 26 December 1990
DOI:https://doi.org/10.1103/PhysRevB.43.7343
©1991 American Physical Society