We construct a class of exact ground states for correlated electrons on pentagon chains in
the high density region and discuss their physical properties. In this procedure the …

It has previously been shown that self‐consistent‐charge density‐functional tight‐binding
(SCC‐DFTB) suffers from a self‐interaction error that leads to artificial stabilization of …

Using a positive semidefinite operator technique we deduce exact ground states for a zig-
zag hexagon chain described by a non-integrable Hubbard model with on-site repulsion …

For a general class of conducting polymers with arbitrary large unit cell and different on-site
Coulomb repulsion values on different type of sites, I demonstrate in exact terms the …

Exact ground states (GS) are deduced for conducting polymers possessing pentagon type of
unit cell. The study is done in the presence of many-body spin–orbit interaction (SOI), local …

The magnetic properties of conducting polymers are investigated within a one-dimensional
periodic Anderson model in which effects stemming from electron–lattice intercations are …

We consider a pentagon chain described by a Hubbard type of model considered under
periodic boundary conditions. The system (i) is placed in an external magnetic field …

A technique based on positive semidefinite operator properties has been used in deducing
exact ground states for hexagon chains of polyphenylene type (hexagons interconnected by …

ABSTRACT A 2D square, two-bands, strongly correlated and non-integrable system is
analysed exactly in the presence of many-body spin–orbit interactions via the method of …

A technique based on the transformation in positive semidefinite form of the Hamiltonian (Ĥ)
is developed to allow the study of the enlargement possibilities of the emergence domain of …