scholarly journals FLUCTUATION CONTRIBUTION TO THE SPECIFIC HEAT IN NON-FERMI MODELS FOR SUPERCONDUCTIVITY

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2988-2993
Author(s):  
I. Tifrea ◽  
I. Grosu ◽  
M. Crisan
Keyword(s):  
Crossover Study ◽  
Specific Heat ◽  
Green’S Function ◽  
Green's Function ◽  
Normal State ◽  
Coherence Length ◽  
Einstein Condensation ◽  
Two Dimensional ◽  
Bose Einstein Condensation ◽  
Bose Einstein

We investigate the fluctuation contribution to the specific heat of a two-dimensional superconductor with a non-Fermi normal state described by a Anderson Green's function [Formula: see text]. The specific heat corrections contain a term proportional to [Formula: see text] and another logarithmic one. We define a coherence length as function of the non-Fermi paramter α, which shows that a crossover study between BCS and Bose-Einstein condensation is possible by varying the non-Fermi parameter α.

CRITICAL PROPERTIES AND DISTRIBUTIONS OF TWO-DIMENSIONAL BOSE–EINSTEIN CONDENSATION

2004 ◽  
Vol 18 (01) ◽  
pp. 103-114 ◽  
Author(s):  
GUANG-XI HU ◽  
JI-PING YE ◽  
JI-XIN DAI ◽  
W. E. EVENSON ◽  
XIAN-XI DAI
Keyword(s):  
Transition Temperature ◽  
Specific Heat ◽  
Numerical Results ◽  
Einstein Condensation ◽  
Two Dimensional ◽  
Critical Properties ◽  
Bose Einstein Condensation ◽  
Analytic Expressions ◽  
Bose Einstein

By studying the critical properties of a 2D Bose–Einstein condensation (BEC) in traps, we obtain the accurate analytic expressions of transition temperature, condensed fraction, and specific heat. The analytic results fit in fairly well with numerical results. We find that an isotropical potential favors most for condensation to occur. With the aid of Bloch summation, we study the distributions of coordinates and momenta of the system. Some clear physical pictures are presented.

BOSE–EINSTEIN CONDENSATION OF PARTICLES TRAPPED IN A BOUNDED HARMONIC POTENTIAL

2001 ◽  
Vol 15 (15) ◽  
pp. 2169-2191 ◽  
Author(s):  
SHALINI LUMB ◽  
S. K. MUTHU
Keyword(s):  
Finite Number ◽  
Specific Heat ◽  
Temperature Curve ◽  
Harmonic Potential ◽  
Einstein Condensation ◽  
Condensate Fraction ◽  
Eigenvalue Spectrum ◽  
Heat Temperature ◽  
Bose Einstein Condensation ◽  
Bose Einstein

The behavior of a finite number of bosons trapped in a bounded harmonic potential is investigated. The eigenvalue spectrum is worked out numerically for three different sizes of the trap. The condensate fraction is determined and is found to increase suddenly below a certain temperature which is a characteristic signature of BEC. The specific heat-temperature curve also shows a peak, with the maximum shifting to lower values and occurring at higher temperatures, as the size of the assembly is reduced.

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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