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Paper detail

Single-Electron Effects in a Coupled Dot-Ring System

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.

preprint2004arXivOpen access
L. MeierA. FuhrerT. IhnK. EnsslinW. WegscheiderM. Bichler
cond-mat.mes-hall
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L. MeierA. FuhrerT. IhnK. EnsslinW. WegscheiderM. Bichler

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