Nonlinear response theories and effective pair potentials

Details Nonlinear response theories and effective pair potentials Nonlinear response theories and effective pair potentials

2007-03-06

arxiv.org/abs/cond-mat/0703136v3

Phys. Rev. B 76, 144103 (2007)

Physics

Condensed Matter

Materials Science

16 pages, 8 figures. v2: some added references, and a few minor modifications. To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.144103

We present a general method based on nonlinear response theory to obtain effective interactions between ions in an electron gas which can also be applied to other systems where an adiabatic separation of time-scales is possible. Nonlinear contributions to the interatomic potential are expressed in terms of physically meaningful quantities, giving insight in the physical properties of the system. The method is applied to various test cases and is found to improve the standard linear and quadratic response approaches. It also reduces the discrepancies previously observed between perturbation theory and density-functional theory results for the proton-proton pair potentials in metallic environments.

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