New interpretation of the role of electron-phonon interactions in electron pairing in superconductivity

摘要

New interpretation of the role of electron-phonon interactions in electron pairing in superconductivity is suggested by comparison with the conventional Bardeen-Cooper-Schrieffer (BCS) theory. We discuss how one independent electron is stabilized in energy in view of the second-order processes in quantum field theory. We suggest that phonon emitted by an electron is received by the same electron, and as a consequence of this phonon exchange between two electronic states with opposite momentum and spins, this independent one electron becomes stabilized in energy. The electron-phonon coupling constants accurately estimated, without definite reason, by many researchers for a long time, can be rationalized. Vibronic stabilization for independent one-electron systems as well as for two-electrons systems can be explained by one-electron theory. That is, our one-electron theory can be more generally applicable than the conventional two-electrons BCS theory.