Superfluid density at finite temperatures in two-dimensional attractive Hubbard model: crossover from BCS to Bose–Einstein condensation region

2000 ◽  
Vol 284-288 ◽  
pp. 419-420
Author(s):  
A Tokumitu
Keyword(s):  
Hubbard Model ◽  
Superfluid Density ◽  
Einstein Condensation ◽  
Two Dimensional ◽  
Bose Einstein Condensation ◽  
Attractive Hubbard Model ◽  
Bose Einstein

scholarly journals TOWARDS BOSE–EINSTEIN CONDENSATION OF ELECTRON PAIRS: ROLE OF SCHWINGER BOSONS

1999 ◽  
Vol 13 (08) ◽  
pp. 925-937 ◽  
Author(s):  
GANG SU ◽  
MASUO SUZUKI
Keyword(s):  
Hilbert Space ◽  
Hubbard Model ◽  
Strong Coupling ◽  
Einstein Condensation ◽  
Electron Pairs ◽  
Bose Einstein Condensation ◽  
Attractive Hubbard Model ◽  
Hilbert Subspace ◽  
Bose Einstein

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.

Bose-Einstein condensation in one- and two-dimensional gases

1974 ◽  
Vol 10 (4) ◽  
pp. 299-319 ◽  
Author(s):  
L. Gunther ◽  
Yoseph Imry ◽  
David J. Bergman
Keyword(s):  
Einstein Condensation ◽  
Two Dimensional ◽  
Bose Einstein Condensation ◽  
Bose Einstein
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