Single-Electron Effects in a Coupled Dot-Ring System

Details Single-Electron Effects in a Coupled Dot-Ring System Single-Electron Effects in a Coupled Dot-Ring System

2004-06-04

arxiv.org/abs/cond-mat/0406118v1

Phys. Rev. B 69, (R) 241302 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.241302

Aharonov-Bohm oscillations are studied in the magnetoconductance of a micron-sized open quantum ring coupled capacitively to a Coulomb-blockaded quantum dot. As the plunger gate of the dot is modulated and tuned through a conductance resonance, the amplitude of the Aharonov-Bohm oscillations in the transconductance of the ring displays a minimum. We demonstrate that the effect is due to a single-electron screening effect, rather than to dephasing. Aharonov-Bohm oscillations in a quantum ring can thus be used for the detection of single charges.

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