Werner Dobrautz

TL;DR: In this article, the authors used the Gutzwiller correlator to study the two-dimensional Hubbard model with repulsive interactions near half filling in the intermediate interaction strength regime (U/t=4) and showed that the similarity-transformed Hamiltonian has extremely compact right eigenvectors, which can be sampled to high accuracy using the FCIQMC method and its initiator approximation.

TL;DR: The core functionalities of NECI are described, including the capabilities to calculate ground and excited state energies, properties via the one- and two-body reduced density matrices, as well as spectral and Green's functions for ab initio and model systems.

TL;DR: In this paper, a similarity-transformed effective Hamiltonian is derived, which is non-Hermitian and contains three-body interactions, which can be solved projectively using a stochastic configuration-interaction formalism.

TL;DR: In this article, a spin-adapted formulation of the FCIQMC algorithm, based on the Graphical Unitary Group Approach (GUGA), is proposed, which enables the exploitation of SU(2) symmetry within this stochastic framework.

TL;DR: In this paper, a similarity-transformed effective Hamiltonian is derived, which is non-Hermitian and contains three-body interactions, which can be solved projectively using a stochastic configuration-interaction formalism.