Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7766
Title: Calculations of exciton behavior for extended Peierls-Hubbard system using Density Matrix Renormalization Group
Authors: Anas Omer Abdelwahab
Keywords: Physics
Issue Date: 2009
Abstract: 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.
Description: A Thesis submitted in fulillment of the requirments for the degree of Master of Science in Computational Condesed Matter Physics
URI: http://hdl.handle.net/123456789/7766
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