Browsing by Author "Anas Omer Abdelwahab"

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    Calculations of exciton behavior for extended Peierls-Hubbard system using Density Matrix Renormalization Group
    (2009) Anas Omer Abdelwahab
    Abstract A symmetrized and dynamical density matrix renormalization group is used to study 1-dimensional Peierls-Hubbard model at half-filling. We have in- vestigated the exciton proprieties, the optical conductivity spectrum and electro-absorption spectrum with strong, intermediate and weak coupling parameter sets for the on-site and neighbor interactions. We were able to capture the Stark effect in the case of strong coupling under static electric field. The intermediate coupling was found to be clear for weak electric field and destroyed for strong one. We were not able to resolve the splitting in the case of weak coupling due to the small binding energy so that small value of electric field could distroy the exciton.