Current fluctuations in composite conductors: Beyond the second cumulant
  Employing the non-linear $\sigma$-model we analyze current fluctuations in coherent composite conductors which contain a diffusive element in-between two tunnel barriers. For such systems we explicitly evaluate the frequency-dependent third current cumulant which also determines the leading Coulomb interaction correction to shot noise. Our predictions can be directly tested in future experiments. 
A.V. Galaktionov and A.D. Zaikin
cond-mat.mes-hall