Coupling of Nonlocal Potentials to Electromagnetic Fields

Details Coupling of Nonlocal Potentials to Electromagnetic Fields Coupling of Nonlocal Potentials to Electromagnetic Fields

2001-01-24

arxiv.org/abs/cond-mat/0101383v3

Physics

Condensed Matter

Materials Science

1 figure, 1 table

Scientific paper

10.1103/PhysRevLett.87.087402

Nonlocal Hamiltonians are used widely in first-principles quantum calculations; the nonlocality stems from eliminating undesired degrees of freedom, e.g. core electrons. To date, attempts to couple nonlocal systems to external electromagnetic (EM) fields have been heuristic or limited to weak or long wavelength fields. Using Feynman path integrals, we derive an exact, closed-form coupling of arbitrary EM fields to nonlocal systems. Our results justify and clarify the couplings used to date and are essential for systematic computation of linear and especially nonlinear response.

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