New 2D Infrared Active Localized Modes of Soliton in trans-(CH)_x

Abstract

Seven localized vibrational modes have been found for the soliton in trans-(CH)_x for a two-dimensional extension of the SSH model that includes the bond-bending term, the Hubbard interaction and the electrostatic pinning. Three of them are infrared active, and they can be used to interpret the three observed infrared absorption lines at 500 cm⁻¹ (or 900 cm⁻¹), 1260 cm⁻¹ and 1370 cm⁻¹.