Optical excitations of Peierls-Mott insulators with bond disorder

Details Optical excitations of Peierls-Mott insulators with bond disorder Optical excitations of Peierls-Mott insulators with bond disorder

2004-05-10

arxiv.org/abs/cond-mat/0405180v2

J. Phys.: Condens. Matter. 17 (2005) 4093-4110

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 13 figures, submitted to Phys. Rev. B

Scientific paper

10.1088/0953-8984/17/26/009

The density-matrix renormalization group (DMRG) is employed to calculate optical properties of the half-filled Hubbard model with nearest-neighbor interactions. In order to model the optical excitations of oligoenes, a Peierls dimerization is included whose strength for the single bonds may fluctuate. Systems with up to 100 electrons are investigated, their wave functions are analyzed, and relevant length-scales for the low-lying optical excitations are identified. The presented approach provides a concise picture for the size dependence of the optical absorption in oligoenes.

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