Schwinger-boson mean-field theory for the two-dimensional antiferromagnetic Heisenberg model with a square lattice

1994 ◽  
Vol 50 (10) ◽  
pp. 6840-6843 ◽  
Author(s):  
Chengeng Wei ◽  
Ruibao Tao
Keyword(s):  
Field Theory ◽  
Heisenberg Model ◽  
Mean Field Theory ◽  
Mean Field ◽  
Square Lattice ◽  
Two Dimensional ◽  
Antiferromagnetic Heisenberg Model

scholarly journals Effect of weak disorder on the BCS–BEC crossover in a two-dimensional Fermi gas

2017 ◽  
Vol 31 (09) ◽  
pp. 1750066
Author(s):  
Ayan Khan ◽  
B. Tanatar
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Fermi Gas ◽  
Ultracold Fermi Gas ◽  
Condensate Fraction ◽  
Two Dimensional ◽  
Weak Disorder ◽  
Unique Nature

In this paper, we study the two-dimensional (2D) ultracold Fermi gas with weak impurity in the framework of mean-field theory where the impurity is introduced through Gaussian fluctuations. We have investigated the role of the impurity by studying the experimentally accessible quantities such as condensate fraction and equation of state of the ultracold systems. Our analysis reveals that at the crossover, the disorder enhances superfluidity, which we attribute to the unique nature of the unitary region and to the dimensional effect.

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