# The Spectral Coupled Cluster Method with $k$ dependency for strongly correlated lattices

## TL;DR

This paper introduces a spectral coupled cluster method tailored for strongly correlated lattice systems, enabling detailed analysis of electronic spectra and Green's functions in complex materials.

## Contribution

It extends the coupled cluster approach to solid state systems, incorporating $k$-dependence and linear response for improved spectral calculations.

## Key findings

- Successfully applied to MnO₂ plane with orbital and magnetic order
- Provided insights into electron energy loss spectra
- Gained understanding of pairing mechanisms in the Hubbard model

## Abstract

We adapt the Coupled Cluster Method to solid state strongly correlated lattice Hamiltonians extending the Coupled Cluster linear response method to the calculation of electronic spectra and obtaining the space-time Fourier transforms of generic Green's functions. We apply our method to the $MnO_2$ plane with orbital and magnetic ordering, to interpret electron energy loss experimental data, and to the Hubbard model, where we get insight into a possible pairing mechanism.