Quantum hypernetted chain approximation for one dimensional fermionic systems

TL;DR

This paper develops a hypernetted chain approximation for one-dimensional fermionic systems, providing a transparent diagram grouping method and applying it to quantum wires modeled as 1D electron gases or electron-hole mixtures.

Contribution

It introduces a new diagram grouping approach for the hypernetted chain approximation in 1D fermionic systems, enhancing equation derivation clarity.

Findings

Derived equations for pair distribution functions in 1D fermionic systems.

Applied the model to quantum wires with pair potentials depending on wire width.

Provided a framework for analyzing quasi-one-dimensional electronic systems.

Abstract

In this comprehensible article we develop, following Fantoni and Rosati formalism, a hypernetted chain approximation for one dimensional systems of fermions. Our scheme differs from previous treatments in the form that the whole set of diagrams is grouped: we do it in terms of non-nodal, non-composite and elementary graphs. This choice makes the deduction of equations more transparent. Equations for the pair distribution functions of one component systems as well as binary mixtures are obtained. We apply they to experimentally realizable quasi-one dimensional systems, the so called quantum wires which we model, within Sommerfeld-Pauli spirit, as a 1D electron gas or as an electron-hole mixture. In order to use our one-dimensional equations we consider pair potentials that depend on the wires width.