How HF solutions for the TB interacting electrons in 2D predict SCES properties and suggest phenomenology for attaining RTS

TL;DR

This paper reinterprets Hartree-Fock solutions of a 2D tight-binding model to explain strongly correlated electron system properties, suggesting pathways to room temperature superconductivity through surface coatings or quantum dot arrays, and providing insights into Mott and metal-insulator transitions.

Contribution

It demonstrates how HF solutions with symmetry breaking can predict SCES properties and proposes new phenomenological approaches for achieving room temperature superconductivity.

Findings

HF solutions can exhibit insulator gaps and pseudogaps in 2D systems.

Surface coating with water molecules may induce room temperature superconductivity.

Screening effects are key to understanding correlation properties in these materials.

Abstract

Former results for a Tight-Binding (TB) model of CuO planes in La2CuO4 are reinterpreted here to underline their wider implications. It is noted that physical systems being appropriately described by the TB model can exhibit the main strongly correlated electron system (SCES) properties, when they are solved in the HF approximation, by also allowing crystal symmetry breaking effects and non-collinear spin orientations of the HF orbitals. It is argued how a simple 2D square lattice system of Coulomb interacting electrons can exhibit insulator gaps and pseudogap states, and quantum phase transitions as illustrated by the mentioned former works. A discussion is also presented here indicating the possibility of attaining room temperature superconductivity, by means of a surface coating with water molecules of cleaved planes of graphite, being orthogonal to its c-axis. The possibility that 2D arrays of quantum dots can give rise to the same effect is also proposed to consideration. The analysis also furnishes theoretical insight to solve the Mott-Slater debate, at least for the La2CuO4 and TMO band structures. The idea is to apply a properly non-collinear GW scheme to the electronic structure calculation of these materials. The fact is that the GW approach can be viewed as a HF procedure in which the screening polarization is also determined. This directly indicates the possibility of predicting the assumed dielectric constant in the previous works. Thus, the results seem to identify that the main correlation properties in these materials are determined by screening. Finally, the conclusions also seem to be of help for the description of the experimental observations of metal-insulator transitions and Mott properties in atoms trapped in planar photonic lattices.