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Paper   IPM / CMNL / 16641
Condensed Matter National Laboratory
  Title:   Self-consistent dielectric functions of materials: Toward accurate computation of Casimir- van der Waals forces
1.  Mohsen Moazzami Gudarzi
2.  Seyed Hamed Aboutalebi
  Status:   Published
  Journal: Science Advances
  No.:  22
  Vol.:  7
  Year:  2021
  Pages:   eabg2272
  Publisher(s):   AAAS
  Supported by:            Swiss National Science Foundation IPM
Research on theoretical calculation of Casimir van der Waals (vdW) forces is characterized by a great number of inconsistencies and conflicting reports with widely differing results for many known materials, including water, contradicting experimental measurements. Despite its importance for conceptual advances in both fundamental aspects and practical applications, a universal framework for the accurate determination of Casimir-vdW forces is lacking. Here, we propose a universal theoretical platform for computing Casimir-vdW forces, accounting for the electronic dielectric constant, optical bandgap, density, and chemical composition. Using this methodology, we determine the dielectric function for 55 materials, over a wide range of photon energies, covering an extensive list of common metals, organic and inorganic semiconductors, and insulators. Internal consistency of the compiled data is validated using optical sum rules and Kramers-Kronig relations. We demonstrate that the calculated vdW forces based on these data match remarkably well with the experimentally measured vdW forces.

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