Shot noise in generic quantum dots: crossover from ballisticto diffusive transport

摘要

We study shot noise for generic quantum dots coupled to two leads and allow forrnan arbitrary strength of diffractive impurity scattering inside the dots. The ballistic quantumrndots possess a mixed classical phase space, where regular and chaotic regions coexist. Inrnabsence of disorder, the noise is systematically suppressed below the universal value of fullyrnchaotic systems, by an amount which varies with the positions of the leads. This suppressionrnis due to the deterministic nature of transport through regular regions and along short chaoticrntrajectories, and disappears by increasing the scattering rate, which is incorporated by usingrnthe Poisson kernel of random matrix theory.