Novel approach to nonlinear susceptibility

Details Novel approach to nonlinear susceptibility Novel approach to nonlinear susceptibility

2003-11-17

arxiv.org/abs/cond-mat/0311387v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The calculation of the third order susceptibility still is a long standing fundamental problem of particular importance in nonlinear nanooptics: Indeed, cancellation of size-dependent terms coming from uncorrelated excitations is expected, but up to now shown for very simple Hamiltonians only. Using a many-body theory recently developed to handle interacting close-to-bosons, we prove it here for \emph{arbitrary} H. This new formalism actually provides the first clean way to calculate nonlinear susceptibilities, with results different from previous ones.

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