Anomalous nonadditive dispersion interactions in systems of three one-dimensional wires

Alston J. Misquitta, Ryo Maezono, Neil D. Drummond, Anthony J. Stone, and Richard J. Needs
Phys. Rev. B 89, 045140 – Published 29 January 2014

Abstract

The nonadditive dispersion contribution to the binding energy of three one-dimensional (1D) wires is investigated using wires modeled by (i) chains of hydrogen atoms and (ii) homogeneous electron gases. We demonstrate that the nonadditive dispersion contribution to the binding energy is significantly enhanced compared with that expected from Axilrod-Teller-Muto–type triple-dipole summations and follows a different power-law decay with separation. The triwire nonadditive dispersion for 1D electron gases scales according to the power law dβ, where d is the wire separation, with exponents β(rs) smaller than 3 and slightly increasing with rs from 2.4 at rs=1 to 2.9 at rs=10, where rs is the density parameter of the 1D electron gas. This is in good agreement with the exponent β=3 suggested by the leading-order charge-flow contribution to the triwire nonadditivity, and is a significantly slower decay than the d7 behavior that would be expected from triple-dipole summations.

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  • Received 8 August 2013
  • Revised 9 January 2014

DOI:https://doi.org/10.1103/PhysRevB.89.045140

©2014 American Physical Society

Authors & Affiliations

Alston J. Misquitta

  • School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS, United Kingdom

Ryo Maezono

  • School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan

Neil D. Drummond

  • Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom

Anthony J. Stone

  • The University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, United Kingdom

Richard J. Needs

  • TCM Group, Cavendish Laboratory, 19, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom

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Vol. 89, Iss. 4 — 15 January 2014

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