# An extended antiferromagnetic model for quasielectrons in identical ionic-covalent bonds

## TL;DR

This paper extends the antiferromagnetic model to describe quasielectrons in ionic-covalent bonds, highlighting the role of bonding coefficients in carrier effective mass within zincblende structures.

## Contribution

It introduces an extended AF model with new operators and subsystem decomposition to better understand quasielectron behavior in ionic-covalent dimers.

## Key findings

- Bonding coefficients significantly influence the effective mass of excited carriers.
- The extended AF model captures density fluctuations and covalent correlations.
- Subsystem decomposition aids in analyzing electron ionization and affinity.

## Abstract

The antiferromagnetic (AF) model is generalized for the quasielectron system composed of identical ionic-covalent dimers. The density-fluctuation and covalent-correlation operators are constructed based on the extended AF density matrices, and the quasielectron system is decomposed into 4-level subsystems for the electron ionization and affinity. By considering the nearest-neighbor hopping near the covalent limit, we can see the importance of the bonding coefficients to the effective mass of the excited carrier in the crystal of the zincblende structure.