Phonons in Thin Layered Structures

Specificities in Optical Absorption of Ultrathin Molecular Film-Structures

“…We will look at the same Green's functions and use the same procedure for their determination. Taking into account the border conditions (7) and expressions for Hamiltonian (1) as well as the equation of motion (2), we arrive at the equation for the requested Green's functions [12,13]. After full time and now only partial spatial Fourier transform of these equations, we arrive at:…”

“…cos y ak on abscissas. In Figure 4, the dispersion laws are presented, more precisely: for non-perturbed (left), x -perturbed (in the middle) and for d - it is called activation energy gap [9][10][11][12]. The number of possible exciton states corresponds to the number of crystallographic planes of this film along the z -axis.…”

“…In case that parameter d assumes grater values too, 4 states that were singled out will be more prominently expressed and asymmetrically distributed compared to the bulk area. These energy conditions are known as localized or Tamm states [1,2,[9][10][11][12].…”

“…Spectral weights of individual Green's functions should be calculated in order to find the probability of occurrence and spatial distribution of exciton states in a film. The starting point is the system of equations for Green's functions (8), but written in a matrix form: probabilities of finding exciton states   [11][12][13]:…”