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Fluctuation Effects in Electron Systems: Their Role in Electron-Pairing Mechanisms
Abstract Electron-electron correlation effects are considered in a system in which the electrons are divisible into two broad classes, namely, quasilocalized and itinerant. In the former they are treated in terms of fluctuating multipole interactions and the resulting collective excitations, namely, extended polarization waves are shown to lead to attractive electron-electron interactions in the itinerant class. This mechanism is particularly effective if an overall energy gap exists above the occupied states in the single-particle spectrum. If the itinerant class is quite dilute, it is suggested that by going beyond RPA the direct Coulomb repulsive term is diminished.
Fluctuation Effects in Electron Systems: Their Role in Electron-Pairing Mechanisms
Abstract Electron-electron correlation effects are considered in a system in which the electrons are divisible into two broad classes, namely, quasilocalized and itinerant. In the former they are treated in terms of fluctuating multipole interactions and the resulting collective excitations, namely, extended polarization waves are shown to lead to attractive electron-electron interactions in the itinerant class. This mechanism is particularly effective if an overall energy gap exists above the occupied states in the single-particle spectrum. If the itinerant class is quite dilute, it is suggested that by going beyond RPA the direct Coulomb repulsive term is diminished.
Fluctuation Effects in Electron Systems: Their Role in Electron-Pairing Mechanisms
Ashcroft, N. W. (author)
Recent Progress in Many-Body Theories ; 1 ; 39-47
1988-01-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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