Coulomb blockade double-dot Aharonov-Bohm interferometer: Giant fluctuations

Electron transport through two parallel quantum dots is a kind of solid-state realization of double path interference We demonstrate that the inter-clot Coulomb correlation and quantum coherence would result in strong current fluctuations with a divergent Fano factor at zero frequency. We also provide physical interpretation for this surprising result, which displays its generic feature and allows us to recover this phenomenon in more complicated systems. (C) 2009 Elsevier B.V. All rights reserved.

National Natural Science Foundation of China 60425412 90503013Albert Einstein Minerva Center This work was supported by the National Natural Science Foundation of China under Grants nos. 60425412 and 90503013. X.Q.L acknowledges the Albert Einstein Minerva Center for Theoretical Physics for partially supporting his visit to the Weizmann Institute of Science. S.G. is grateful to the Max Planck Institute for the Physics of Complex Systems Dresden Germany for kind hospitality.