Transition between Pauli Exclusion and Coulomb Interaction in the Noise Behavior of Resonant Tunneling Diodes

We present results from noise measurements on double barrier resonant tunnel diodes, down to extremely low current bias value. Such measurements were performed fro current values between 0.8 pA and 10 nA, in order to investigate the theoretically predicted deviations from full shot noise due to the interplay of Coulomb repulsion and Pauli exclusion. While Coulomb effects are visible also in the proximity of the current peak, Pauli exclusion is expected to contribute only at very low current levels, which has motivated our effort towards an increase in the sensitivity of the measuring equipment.