We extend the symmetrized density-matrix renormalization-group method to compute the dynamic nonlinear optical coefficients for long chains. By computing correction vectors in the appropriate symmetry subspace, we obtain the dynamic polarizabilities, ̧ij(ω), and third-order polarizabilities γijkl(ω,ω,ω,) of the Hubbard and "U-V" chains in an all transpolyacetylene geometry, with and without dimerization. We rationalize the behavior of ᾱ and γ̄ on the basis of the low-lying excitation gaps in the system.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1999|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics