Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 23: Korrelierte Elektronensysteme Theorie III

TT 23.4: Talk

Thursday, March 29, 2001, 15:15–15:30, H

Excitons in the Peierls-Hubbard model — •Eric Jeckelmann — Fachbereich Physik, Philipps-Universität Marburg

New correlation functions are proposed to investigate the structure of optical excitations in strongly correlated systems. This approach is applied to the one-dimensional Peierls-Hubbard model of conjugated polymers in combination with the recently developed dynamical density-matrix renormalization group [1]. I will show that one can accurately determine optical excitation properties using these techniques, in particular, identify excitons and evaluate their size. The regime of parameters representative of real materials has been thoroughly investigated and I will discuss the consequences of the results obtained for the theory of the optical absorption in conjugated polymers.

[1] E. Jeckelmann, F. Gebhard, and F.H.L. Essler, Phys. Rev. Lett. 85, 3910 (2000)