Magnetic interactions in molecules and highly correlated materials: physical content, analytical derivation, and rigorous extraction of magnetic Hamiltonians

JP Malrieu, R Caballol, CJ Calzado, C De Graaf… - Chemical …, 2014 - ACS Publications
Magnetism is a phenomenon that has always captured the imagination of humans. Its
discovery in the western world is attributed to the ancient Greek civilization. More than 2500 …

Self-Consistent Field Approach for the Variational Quantum Eigensolver: Orbital Optimization Goes Adaptive

A Fitzpatrick, A Nykanen, NW Talarico… - The Journal of …, 2024 - ACS Publications
We present a self-consistent field (SCF) approach within the adaptive derivative-assembled
problem-tailored ansatz variational quantum eigensolver (ADAPT-VQE) framework for …

Spin-pure stochastic-CASSCF via GUGA-FCIQMC applied to iron–sulfur clusters

W Dobrautz, O Weser, NA Bogdanov… - Journal of Chemical …, 2021 - ACS Publications
In this work, we demonstrate how to efficiently compute the one-and two-body reduced
density matrices within the spin-adapted full configuration interaction quantum Monte Carlo …

Exchange Coupling Interactions from the Density Matrix Renormalization Group and N-Electron Valence Perturbation Theory: Application to a Biomimetic Mixed …

M Roemelt, V Krewald, DA Pantazis - Journal of Chemical Theory …, 2018 - ACS Publications
The accurate description of magnetic level energetics in oligonuclear exchange-coupled
transition-metal complexes remains a formidable challenge for quantum chemistry. The …

A dynamic correlation dressed complete active space method: Theory, implementation, and preliminary applications

S Pathak, L Lang, F Neese - The Journal of Chemical Physics, 2017 - pubs.aip.org
Complete Active Space SCF (CASSCF) theory may provide poor 0th order descriptions due
to the lack of dynamic correlation. The most popular post-CASSCF approaches for …

Spin–flip non-orthogonal configuration interaction: a variational and almost black-box method for describing strongly correlated molecules

NJ Mayhall, PR Horn, EJ Sundstrom… - Physical Chemistry …, 2014 - pubs.rsc.org
In this paper, we report the development, implementation, and assessment of a novel
method for describing strongly correlated systems, spin–flip non-orthogonal configuration …

A theoretical perspective of the relationship between the structures and luminescence properties of red thermally activated delayed fluorescence molecules

H Liu, K Zhang, H Zou, Q Mu, X Wang… - Physical Chemistry …, 2022 - pubs.rsc.org
Orange and red thermally activated delayed fluorescence (TADF) emitters have shown
promising applications in organic light emitting diodes (OLEDs) and the bio-medical field …

Toward a Stochastic Complete Active Space Second-Order Perturbation Theory

AA Safari, RJ Anderson, GL Manni - The Journal of Physical …, 2023 - ACS Publications
In this work, an internally contracted stochastic complete active space second-order
perturbation theory, stochastic− CASPT2, is reported. The method relies on stochastically …

First-principle design of Blatter's diradicals with strong ferromagnetic exchange interactions

A Bajaj, ME Ali - The Journal of Physical Chemistry C, 2019 - ACS Publications
The stable organic diradicals that exhibit strong intramolecular ferromagnetic exchange
interactions are suitable building blocks for organic magnetic materials (OMMs). Based on …

Orbital entanglement analysis of exchange-coupled systems

CJ Stein, DA Pantazis, V Krewald - The journal of physical …, 2019 - ACS Publications
A new tool for the interpretation of multiconfigurational wave functions representing the spin
states of exchange-coupled transition metal complexes is introduced. Based on orbital …