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Structural and electronic instabilities in polyacenes: Density-matrix renormalization group study of a long-range interacting model.

Raghu, C and Pati, Anusooya Y and Ramasesha, S (2002) Structural and electronic instabilities in polyacenes: Density-matrix renormalization group study of a long-range interacting model. In: Physical Review B, 65 (15). 155204-1-155204-9.

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Abstract

We have carried out density-matrix renormalization group calculations on the ground state of long polyacene oligomers within a Pariser-Parr-Pople (PPP) Hamiltonian. The PPP model includes long-range electron correlations which are required for physically realistic modeling of conjugated polymers. We have obtained the ground-state energy as a function of the dimerization δ and various correlation functions and structure factors for δ=0. From energetics, we find that the nature of the Peierls’ instability in polyacene is conditional and strong electron correlations enhance the dimerization. The cis form of the distortion is favored over the trans form. However, from the analysis of correlation functions and associated structure factors, we find that polyacene is not susceptible to the formation of a bond order wave, spin-density wave, or a charge-density wave in the ground state.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ernet.in/id/eprint/7423

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