# Density matrix renormalization group study of excitons in polydiacetylene chains

@inproceedings{Barcza2010DensityMR, title={Density matrix renormalization group study of excitons in polydiacetylene chains}, author={Gergely Barcza and Ors Legeza and Florian Gebhard and Reinhard M Noack}, year={2010} }

- Published 2010
DOI:10.1103/PhysRevB.81.045103

We study the elementary excitations of a model Hamiltonian for the $\pi$-electrons in poly-diacetylene chains. In these materials, the bare band gap is only half the size of the observed single-particle gap and the binding energy of the exciton of 0.5 eV amounts to 20% of the single-particle gap. Therefore, exchange and correlations due to the long-range Coulomb interaction require a numerically exact treatment which we carry out using the density-matrix renormalization group (DMRG) method… CONTINUE READING

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