Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-04-20
Inter. J. Mod. Phys. B13, 925 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
Revtex, one figure
Scientific paper
10.1142/S0217979299000771
It can be shown that the bosonic degree of freedom of the tightly bound on-site electron pairs could be separated as Schwinger bosons. This is implemented by projecting the whole Hilbert space into the Hilbert subspace spanned by states of two kinds of Schwinger bosons (to be called binon and vacanon) subject to a constraint that these two kinds of bosonic quasiparticles cannot occupy the same site. We argue that a binon is actually a kind of quantum fluctuations of electron pairs, and a vacanon corresponds to a vacant state. These two bosonic quasiparticles may be responsible for the Bose-Einstein condensation (BEC) of the system associated with electron pairs. These concepts are also applied to the attractive Hubbard model with strong coupling, showing that it is quite useful. The relevance of the present arguments to the existing theories associated with the BEC of electron pairs is briefly commented.
Su Gang
Suzuki Masuo
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