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In this paper, the single-particle-reduced entropy of a nanowire field-effecttransistor (NWFET) in the Coulomb blockade regime is studied by means of amulti-configurational self-consistent Green's function approach. Assuming thatthe many-body statistical preparation of the system is described by a mixtureof Slater determinants of relevant natural orbitals, thesingle-particle-reduced entropy can be interpreted as a measure of the degreeof mixture of the system's preparation. Considering the realistic case of anInP based NWFET, we present current-voltage characteristics and entropydiagrams for a range of equilibrium and non-equilibrium states. Signatures offew-electron Coulomb charging effects can be identified, as known fromexperimental situations. Furthermore, we illustrate the significance of thesingle-particle-reduced entropy by analyzing the corresponding electronicconfigurations.

On the single-particle-reduced entropy of a gated nanowire system in the Coulomb blockade regime