Charge kinks as Raman scatterers in quarter-filled ladders
Abstract
Charge kinks are considered as fundamental excitations in quarter-filled charge-ordered ladders. The strength of the coupling of the kinks to the three-dimensional lattice depends on their energy. The integrated intensity of Raman scattering by kink-antikink pairs is proportional to φ 5 or φ 4, where φ is the order parameter. The exponent is determined by the system parameters and by the strength of the electron-phonon coupling.
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