Abstract
Transport in a semiopen Kondo-correlated quantum dot is mediated through more than one quantum state. Using the Keldysh technique and the equation of motion method, we study the shot noise $S$ for a wide range of source-drain voltages ${V}_{sd}$ within a model incorporating the additional states as a background continuum, demonstrating the importance of the Fano interference. In the absence of the interference, the noise is revealed to be a probe of the second moment of the local density of states, and our theory reproduces the well-known peak structure around the Kondo temperature in the $S\text{\ensuremath{-}}{V}_{sd}$ curve. More significantly, it is found that taking account of the background transmission, the voltage dependence of the noise exhibits rich peak-dip line shapes, indicating the presence of the Fano effect. We further demonstrate that due to its two-particle nature, the noise is more sensitive to the quantum interference effect than the simple current.
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