CURRENT FLUCTUATIONS IN 1D DOUBLE - BARRIER HETEROSTRUCTURES

A theoretical formalism to study the current-noise characteristic of o ne-dimensional double barrier heterostructures taking into account cor relation effects is developed within the context of the Keldysh nonequ ilibrium Green functions. The effects of the Coulomb blockade on the c haracteristic curve (current versus voltage) and on the current fluctu ation are studied in a selfconsistent calculation. For the static case a reduction of the full shot noise is observed. The effects of the ba rrier characteristics on the transport properties are also analyzed. A connection between the noise frequency spectrum and the transit time of the electron going along the structure is established.