Shot Noise in Chaotic Systems: “Classical” to Quantum Crossover

This paper is devoted to study of the classical-to-quantum crossover of the shot noise in chaotic systems. This crossover is determined by the ratio of the particle dwell time in the system, τd, to the characteristic time for diffraction tEλ^-1|ln|, where λ is the Lyapunov exponent. The shot noise vanishes when tEτd, while it reaches a universal value in the opposite limit. Thus, the Lyapunov exponent of chaotic mesoscopic systems may be found by shot noise measurements.