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Updated: Mar 10, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
A Fractionally Ionic Approach to Polarizability and van der Waals Many-Body Dispersion Calculations
Tim Gould1, Sébastien Lebègue2,3, János G Ángyán2,3,4
1Qld Micro- and Nanotechnology Centre, Griffith University , Nathan, Qld 4111, Australia.
Abstract:
By explicitly including fractionally ionic contributions to the polarizability of a many-component system, we are able to significantly improve on previous atom-wise many-body van der Waals approaches with essentially no extra numerical cost. For nonionic systems, our method is comparable in accuracy to existing approaches. However, it offers substantial improvements in ionic solids, e.g., producing better polarizabilities by over 65% in some cases. It has particular benefits for two-dimensional transition metal dichalcogenides and interactions of H2 with modified coronenes, ionic systems of nanotechnological interest. It thus offers an efficient improvement on existing approaches, valid for a wide range of systems.
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