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Fermi resonance solitary wave on the interface between two layers of organic semiconductors.

The nonlinear dynamics on the interface between two layers of organic semiconductors is discussed for the case of Fermi resonance, which occurs when the excitation energy \vc on one side of the interface approximately equals 2\vb , where \vb is the excitation energy on the other side. In the long wave limit the nonlinear periodic waves can propagate in the form of solitons. A variational approach to the description of such solitary excitations is suggested, which can be applied in a broad range of system parameters.