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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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