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

Misquitta, A. J. and Maezono, R. and Drummond, Neil and Stone, A. J. and Needs, R. J. (2014) Anomalous nonadditive dispersion interactions in systems of three one-dimensional wires. Physical review B, 89 (4). ISSN 1098-0121

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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 d^(-beta), where d is the wire separation, with exponents beta(r_s) smaller than 3 and slightly increasing with r_s from 2.4 at r_s=1 to 2.9 at r_s=10, where r_s is the density parameter of the 1D electron gas. This is in good agreement with the exponent beta=3 suggested by the leading-order charge-flow contribution to the triwire nonadditivity, and is a significantly slower decay than the ~d^(-7) behavior that would be expected from triple-dipole summations.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Additional Information:
©2014 American Physical Society
ID Code:
68963
Deposited By:
Deposited On:
25 Mar 2014 09:07
Refereed?:
Yes
Published?:
Published
Last Modified:
04 Jul 2020 02:17