SUPPRESSION OF CURRENT NOISE DUE TO THE COULOMB CORRELATION

Effect of the Coulomb interaction on current noise in a quantum dot is studied from a theoretical point of view by using the Anderson model. Based on the perturbation expansion in the coupling between the Jot a nd reservoirs in terms of the Keldysh Green function, current and curr ent noise are computed including infinite order of the Coulomb interac tion. We find that the Coulomb correlation shifts the maxima of equili brium noise and suppresses nonequilibrium noise as functions of the bi as voltage across the quantum dot. In addition, we examine the case in which the Kondo effect is possibly observed in transport through a qu antum dot, and show the zero-bias anomalies in I-V characteristics.