Excitonic correlations in the system of gated metallic wires with the applied Zeeman magnetic field.

We have studied the electron–electron interactions in the system composed of two metallic one-dimensional point contact and zero-sized wires, in the applied electric field and exposed to the influence of the external Zeeman magnetic field. The interactions between the electrons within wires have been taken into account within the usual Hubbard model. We have considered different limits of particle-filling on the atomic lattice site positions. We show the existence of the excitonic pairing in this one-dimensional system in different limits of the electron–electron interactions, magnetic field, and temperature. We demonstrate that the usual Hubbard- U interaction leads to strong electron localization, which enhances the local antiferromagnetic order in the system. [ABSTRACT FROM AUTHOR]