Median-point approximation and its application for the study of fermionic systems

25 May 2020 Makogon Dmytro Smith Cristiane Morais

We introduce a novel median-point approximation method as an extension of the Laplace's (saddle-point approximation) method and illustrate it with applications for real scalar functions. Furthermore, we consider a system of fermions with local interactions on a lattice and apply a multivariate generalization of the method for evaluation of the corresponding partition function, aiming at investigating the possibility of a superconducting second-order phase transition... (read more)

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  • STRONGLY CORRELATED ELECTRONS
  • STATISTICAL MECHANICS