Theory of Quadratic Response Functions
- 1 June 1963
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 130 (5) , 1792-1797
- https://doi.org/10.1103/physrev.130.1792
Abstract
The general quantum theory of quadratic response functions, such as the optical-frequency quadratic polarizability of dielectrics, is developed on the lines of Kubo's density matrix—Green's function theory of linear response functions. Sum rule series are obtained, and applied to the quadratic polarizability. A suitable form of Kramers-Kronig relations for quadratic response functions is developed.Keywords
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