Abstract

Employing the Fulton-Gouterman transformation (FGT), a non-conventional type of excited states (“exotic”) in exciton-phonon systems has been found recently. These states are characterized by a stiffening of the phononic subsystem. It is shown that the phononic part for these non-conventionalexciton-phonon states is well described by squeezed oscillatory functional forms. This can be understood analytically by subjecting the FG Hamiltonian to a Fröchlich-type of unitary transformation.

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