Abstract
We consider the transport through a system of three coupled quantum dots in a perpendicular magnetic field. At zero field, destructive interference can trap an electron in a dark state—a coherent superposition of dot states that completely blocks current flow. The magnetic field can disrupt this interference, giving rise to oscillations in the current and its higher-order statistics as the field is increased. These oscillations have a period of either the flux-quantum or half the flux quantum, depending on the dot geometry. We give results for the stationary current, and the shot noise and skewness both at zero and finite frequency.
- Received 21 May 2007
DOI:https://doi.org/10.1103/PhysRevB.76.245319
©2007 American Physical Society