Beyond extended dynamical mean-field theory: Dual boson approach to the two-dimensional extended Hubbard model
نویسندگان
چکیده
منابع مشابه
Dual boson approach to collective excitations in correlated fermionic systems
We develop a general theory of a boson decomposition for both local and non-local interactions in lattice fermion models which allows us to describe fermionic degrees of freedom and collective charge and spin excitations on equal footing. An efficient perturbation theory in the interaction of the fermionic and the bosonic degrees of freedom is constructed in so-called dual variables in the path...
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