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Excitonic and vibronic spectra of Frenkel excitons (FEs) in a two-dimensional (2D) lattice with one molecule per unit cell have been studied and their manifestation in the linear absorption is simulated. We use the Green function formalism, the vibronic approach, see Lalov and Zhelyazkov [I.J. Lalov, I. Zhelyazkov, Phys. Rev. B 75 (2007) 245435], and the nearest-neighbor approximation to find expressions...
The paper offers a theoretical model of Frenkel and charge-transfer excitons coupling in a two-dimensional quadratic lattice. This coupling manifests a strong anisotropy in the plane of the lattice and perpendicular to it. The paper contains symmetry analysis of Frenkel and charge-transfer excitons coupling for the two cases. The spectra of the linear absorption in the excitonic and vibronic regions...
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