Correlation effects on the electronic state and transport through a small interacting region

Abstract

We investigate the effect of the on-site and the nearest-neighbor Coulomb interaction on the electronic state and transport phenomena of the quasi-one-dimensional quantum wire including a small interacting region. The stability and the conductance for several electronic states are calculated as a function of the chemical potential μ using the recursive Green's function method and the Kubo formula. It is found that electronic states, in which spins in the small region are aligned antiferromagnetically in the y-direction and ferromagnetically in the x-direction, are stabilized over a wide range of the chemical potential.