Phys. Rev. B 69, 241302(R) (2004) [4 pages]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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.241302
DOI:
10.1103/PhysRevB.69.241302
PACS:
73.23.−b, 84.37.+q
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