Projection Method for Exact Diagonalization in the Strong Coupling Limit for Frustrated Models with Highly Degenerate Ground States

TL;DR

This paper introduces a projection-based exact diagonalization technique tailored for frustrated models with highly degenerate ground states in the strong coupling limit, demonstrated on a spinless fermion model on a triangular lattice.

Contribution

The paper presents a novel projection ED method applicable to frustrated models with degenerate ground states, expanding computational tools for strongly correlated systems.

Findings

Effective application to XXZ and t-V models in the strong coupling limit

Demonstrated usefulness on a triangular lattice fermion model

Provides a general approach for frustrated systems with degeneracy

Abstract

In this paper, we carry out a new technique named projection ED and indicate that it is applicable to the frustrated models, e.g., XXZ spin-1/2 Heisenberg and spinless fermion t-V models, in the strong coupling limit with highly degenerate ground states in a general way. As an example, we deal with a spinless fermion t-V model on a triangular lattice and show the usefulness of the method.