scholarly journals Mean-field theory of interacting triplons in a two-dimensional valence-bond solid: Stability and properties of many-triplon states

2020 ◽  
Vol 102 (1) ◽  
Author(s):  
R. L. Doretto
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Valence Bond ◽  
Two Dimensional ◽  
Valence Bond Solid

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.

Resonating-valence-bond state with fermionic charges and bosonic spins: Mean-field theory

1989 ◽  
Vol 40 (1) ◽  
pp. 850-853 ◽  
Author(s):  
Karsten Flensberg ◽  
Per Hedegrd ◽  
Michael Brix Pedersen
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Valence Bond ◽  
Bond State ◽  
Resonating Valence Bond
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