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Accurate and Efficient Method for Many-Body van der Waals Interactions

Author(s): Tkatchenko, Alexandre; DiStasio, Robert A. Jr.; Car, Roberto; Scheffler, Matthias

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Abstract: An efficient method is developed for the microscopic description of the frequency-dependent polarizability of finite-gap molecules and solids. This is achieved by combining the Tkatchenko-Scheffler van der Waals (vdW) method [Phys. Rev. Lett. 102, 073005 (2009)] with the self-consistent screening equation of classical electrodynamics. This leads to a seamless description of polarization and depolarization for the polarizability tensor of molecules and solids. The screened long-range many-body vdW energy is obtained from the solution of the Schrödinger equation for a system of coupled oscillators. We show that the screening and the many-body vdW energy play a significant role even for rather small molecules, becoming crucial for an accurate treatment of conformational energies for biomolecules and binding of molecular crystals. The computational cost of the developed theory is negligible compared to the underlying electronic structure calculation.
Publication Date: Jun-2012
Electronic Publication Date: 7-Jun-2012
Citation: Tkatchenko, Alexandre, DiStasio, Robert A. Jr., Car, Roberto, Scheffler, Matthias. (2012). Accurate and Efficient Method for Many-Body van der Waals Interactions. Physical Review Letters, 108 (23), 10.1103/PhysRevLett.108.236402
DOI: doi:10.1103/PhysRevLett.108.236402
ISSN: 0031-9007
EISSN: 1079-7114
Pages: 236402-1 - 236402-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Final published version. This is an open access article.

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