Dielectric Properties of Nanoconfined Water: A Canonical Thermopotentiostat Approach

Deißenbeck, F. and Freysoldt, C. and Todorova, M. and Neugebauer, J. and Wippermann, S.

Volume: 126 Pages:
DOI: 10.1103/PhysRevLett.126.136803
Published: 2021

We introduce a novel approach to sample the canonical ensemble at constant temperature and applied electric potential. Our approach can be straightforwardly implemented into any density-functional theory code. Using thermopotentiostat molecular dynamics simulations allows us to compute the dielectric constant of nanoconfined water without any assumptions for the dielectric volume. Compared to the commonly used approach of calculating dielectric properties from polarization fluctuations, our thermopotentiostat technique reduces the required computational time by 2 orders of magnitude. © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the ""Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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