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- Electron pairing in one-dimensional anharmonic crystal latticesPublication . Velarde, M. G.; Brizhik, L.; Chetverikov, A. P.; Cruzeiro, Leonor; Ebeling, W.; Röpke, G.We show that when anharmonicity is added to the electron–phonon interaction it facilitates electron pairing in a localized state. Such localized state appears as singlet state of two electrons bound with the traveling local lattice soliton distortion, which survives when Coulomb repulsion is included.