Pairing in Atomic Aggregates
Electrons near the Fermi surface in a superconductor, that is in a system which conducts with zero resistivity, interact to form correlated pairs. This idea was first suggested by Cooper  and since then the pairs are often called “Cooper pairs”. They are constructed from states in which the two electrons have zero total spin and equal and opposite linear momentum k and −k. As discussed in the previous chapter, the effective interaction between electrons is a result of the virtual emission of a phonon by one electron and its absorption by another. This interaction causes scattering of an electron pair from states (k, −k) to states (k′, −k′) with an amplitude V k′k which depends on the electron-phonon coupling and on the phonon spectrum.
KeywordsCooper Pair Halo Nucleus Phonon Coupling Small Fullerene Pair Wave Function
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