Abstract
We consider the origin of striking resonances, observed in the low-temperature magneto-resistance of submicron-sized quantum dots. The magnetic-field positions of the resonances are correlated to the depopulation of Landau levels in the dots, while their amplitude can correspond to a near-complete reflection of the applied current. In order to determine the origin of these features, we formulate a model for edge-state scattering in quantum dots which properly accounts for the magnetic-field-dependent evolution of their self-consistent potential profile. The resonances are thus ascribed to a sudden increase in back scattering, mediated by edge states trapped inside the dot. A similar treatment which ignores the high-field evolution of the dot profile is unable to reproduce the resonances, which we therefore conclude provide an important demonstration of the role of self-consistent effects in mesoscopic systems.
Original language | English (US) |
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Pages (from-to) | 7477-7484 |
Number of pages | 8 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 56 |
Issue number | 12 |
DOIs | |
State | Published - 1997 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics