Article (Périodiques scientifiques)
Molecule-Environment Embedding with Quantum Monte Carlo: Electrons Interacting with Drude Oscillators.
DITTE, Matej; BARBORINI, Matteo; TKATCHENKO, Alexandre
2025In Journal of Chemical Theory and Computation
Peer reviewed vérifié par ORBi
 

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Résumé :
[en] We present a comprehensive investigation of the El-QDO embedding method [Phys. Rev. Lett. 131, 228001 (2023)], where molecular systems described through the electronic Hamiltonian are immersed in a bath of charged quantum harmonic oscillators, i.e., quantum Drude oscillators (QDOs). In the El-QDO model, the entire system of electrons and drudons─the quantum particles in the QDOs─is modeled through a single Hamiltonian which is solved through quantum Monte Carlo (QMC) methods. We first describe the details of the El-QDO Hamiltonian, of the proposed El-QDO ansatz, and of the QMC algorithms implemented to integrate both electronic and drudonic degrees of freedom. Then we analyze short-range regularization functions for the interacting potential between electrons and QDOs in order to accurately treat equilibrium and repulsive regions, resolving the overpolarization error that occurs between the electronic system and the environment. After benchmarking various regularization (damping) functions on the cases of argon and water dimers, the El-QDO method is applied to study the solvation energies of the benzene and water dimers, verifying the accuracy of the El-QDO approach compared to accurate fully electronic ab initio calculations. Furthermore, through the comparison of the El-QDO interaction energies with the components of Symmetry-Adapted Perturbation Theory calculations, we illustrate the El-QDO's explicit many-body treatment of electrostatic, polarization, and dispersion interactions between the electronic subsystem and the environment.
Centre de recherche :
ULHPC - University of Luxembourg: High Performance Computing
Précision sur le type de document :
Compte rendu
Disciplines :
Physique
Auteur, co-auteur :
DITTE, Matej  ;  University of Luxembourg
BARBORINI, Matteo  ;  University of Luxembourg
TKATCHENKO, Alexandre  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Co-auteurs externes :
no
Langue du document :
Anglais
Titre :
Molecule-Environment Embedding with Quantum Monte Carlo: Electrons Interacting with Drude Oscillators.
Date de publication/diffusion :
30 avril 2025
Titre du périodique :
Journal of Chemical Theory and Computation
ISSN :
1549-9618
eISSN :
1549-9626
Maison d'édition :
American Chemical Society (ACS), Etats-Unis
Peer reviewed :
Peer reviewed vérifié par ORBi
Projet européen :
HE - 101054629 - FITMOL - Field-Theory Approach to Molecular Interactions
Projet FnR :
FNR18093472 - MBD-in-BMD - Many-body Dispersion Interactions In Bio-molecular Dynamics, 2023 (01/09/2024-31/08/2027) - Alexandre Tkatchenko
Organisme subsidiant :
European Research Council
Fonds National de la Recherche Luxembourg
European Union
Disponible sur ORBilu :
depuis le 02 mai 2025

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