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Exciton transfer free energy from Car–Parrinello molecular dynamics

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Abstract

A computational approach is presented which allows the calculation of free energies profiles for exciton transfer processes within the framework of ab initio molecular dynamics (AIMD) simulations, sampling both the electronic and the nuclear degrees of freedom. To achieve this, restraining potentials are imposed on the centres of maximally localized Wannier orbitals. The resulting quantum-mechanical orbital forces are derived analytically and implemented in an AIMD program. In analogy to classical umbrella sampling techniques, these restraints are used to control an exciton transfer by incrementally moving the Wannier centres corresponding to the electron–hole pair along a suitable reaction coordinate. The new method is applied to study exciton transfer between two stacked penta(3-methylthiophene) molecules as a function of intermolecular distance. From the resulting free energy profiles, exciton transfer rates and diffusion constants are estimated, which prove to be in line with experimental results.

Graphical abstract: Exciton transfer free energy from Car–Parrinello molecular dynamics

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Article information


Submitted
27 Nov 2019
Accepted
14 Jan 2020
First published
16 Jan 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Exciton transfer free energy from Car–Parrinello molecular dynamics

C. Schwermann and N. L. Doltsinis, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06419B

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