Related papers: Molecular Interactions Induced by a Static Electric Field in Quantum Mechanics and Quantum Electrodynamics

Molecular Interactions Induced by a Static Electric Field in Quantum Mechanics and Quantum Electrodynamics

URL: http://arxiv.org/abs/2103.16396v2
Date: Sun, 13 Mar 2022 17:20:15 GMT
Title: Molecular Interactions Induced by a Static Electric Field in Quantum Mechanics and Quantum Electrodynamics
Authors: Mohammad Reza Karimpour, Dmitry V. Fedorov, Alexandre Tkatchenko
Abstract summary: We study the interaction between two neutral atoms or molecules subject to a uniform static electric field. Our focus is to understand the interplay between leading contributions to field-induced electrostatics/polarization and dispersion interactions.
Score: 68.98428372162448
License: http://creativecommons.org/licenses/by/4.0/
Abstract: By means of quantum mechanics and quantum electrodynamics applied to coupled harmonic Drude oscillators, we study the interaction between two neutral atoms or molecules subject to a uniform static electric field. Our focus is to understand the interplay between leading contributions to field-induced electrostatics/polarization and dispersion interactions, as considered within the employed Drude model for both non-retarded and retarded regimes. For the first case, we present an exact solution for two coupled oscillators obtained by diagonalizing the corresponding quantum-mechanical Hamiltonian and demonstrate that the external field can control the strength of different intermolecular interactions and relative orientations of the molecules. In the retarded regime described by quantum electrodynamics, our analysis shows that field-induced electrostatic and polarization energies remain unchanged (in isotropic and homogeneous vacuum) compared to the nonretarded case. For interacting species modeled by quantum Drude oscillators, the developed framework based on quantum mechanics and quantum electrodynamics yields the leading contributions to molecular interactions under the combined action of external and vacuum fields.

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