Variational approximations of bifurcations of asymmetric solitons in cubic-quintic nonlinear Schrödinger lattices
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Abstract
Using a variational approximation we study discrete solitons of anonlinear Schrödinger lattice with a cubic-quintic nonlinearity.Using an ansatz with six parameters we are able to approximatebifurcations of asymmetric solutions connecting site-centered andbond-centered solutions and resulting in the exchange of theirstability. We show that the numerical and variationalapproximations are quite close for solitons of small powers.
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