The analytic expressions for the linear and non-linear optical response functions of a two-sites Holstein-Hubbard model with periodic and antiperiodic boundary conditions are obtained. They show that an antiperiodic dimer can be used to describe the main features of the linear optical spectrum of a half-filled dimerized mono-dimensional system. One also finds that the description of the non-linear optical properties are appropriate only for systems with the 2A(g) above the 1B(u) since only the ionic contribution to the A(g) state can be described.
Linear and non-linear optical properties of periodic and antiperiodic dimers
MENEGHETTI, MORENO
1999
Abstract
The analytic expressions for the linear and non-linear optical response functions of a two-sites Holstein-Hubbard model with periodic and antiperiodic boundary conditions are obtained. They show that an antiperiodic dimer can be used to describe the main features of the linear optical spectrum of a half-filled dimerized mono-dimensional system. One also finds that the description of the non-linear optical properties are appropriate only for systems with the 2A(g) above the 1B(u) since only the ionic contribution to the A(g) state can be described.
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