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07 February 2025
 
  » arxiv » 1609.0180

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Wire and extended ladder model predict THz oscillations in DNA monomers, dimers and trimers
K. Lambropoulos ; K. Kaklamanis ; A. Morphis ; M. Tassi ; R. Lopp ; G. Georgiadis ; M. Theodorakou ; M. Chatzieleftheriou ; C. Simserides ;
Date 1 Sep 2016
AbstractWe call extit{monomer} a B-DNA base pair and study, analytically and numerically, electron or hole oscillations in extit{monomers}, extit{dimers} and extit{trimers}. We employ two Tight Binding (TB) approaches: (I) at the base-pair level, using the on-site energies of the base pairs and the hopping parameters between successive base pairs i.e. extit{a wire model}, and (II) at the single-base level, using the on-site energies of the bases and the hopping parameters between neighbouring bases, specifically between (a) two successive bases in the same strand, (b) complementary bases that define a base pair, and (c) diagonally located bases of successive base pairs, i.e. extit{an extended ladder model} since it also includes the diagonal hoppings (c). For extit{monomers}, with TB II, we predict periodic carrier oscillations with frequency $f approx$ 50-550 THz. For extit{dimers}, with TB I, we predict periodic carrier oscillations with $f approx$ 0.25-100 THz. For extit{trimers made of identical monomers}, with TB I, we predict periodic carrier oscillations with $f approx$ 0.5-33 THz. In other cases, either with TB I or TB II, the oscillations may be not strictly periodic, but Fourier analysis shows similar frequency content. For dimers and trimers, TB I and TB II are successfully compared giving complementary aspects of the oscillations.
Source arXiv, 1609.0180
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