Effect of Charge Fluctuations on the Persistent Current through a Quantum Dot

Details Effect of Charge Fluctuations on the Persistent Current through a Quantum Dot Effect of Charge Fluctuations on the Persistent Current through a Quantum Dot

2001-08-06

arxiv.org/abs/cond-mat/0108095v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.65.153303

We study coherent charge transfer between an Aharonov-Bohm ring and a side-attached quantum dot. The charge fluctuation between the two sub-structures is shown to give rise to algebraic suppression of the persistent current circulating the ring as the size of the ring becomes relatively large. The charge fluctuation at resonance provides transition between the diamagnetic and the paramagnetic states. Universal scaling, crossover behavior of the persistent current from a continuous to a discrete energy limit in the ring is also discussed.

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