Faithful fermionic representations of the Kondo lattice model

Details Faithful fermionic representations of the Kondo lattice model Faithful fermionic representations of the Kondo lattice model

2011-02-25

arxiv.org/abs/1102.5243v2

Phys. Rev. B 83, 235103 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures, minor updates

Scientific paper

10.1103/PhysRevB.83.235103

We study the Kondo lattice model using a class of canonical transformations that allow us to faithfully represent the model entirely in terms of fermions without constraints. The transformations generate interacting theories that we study using mean field theory. Of particular interest is a new manifestly O(3)-symmetric representation in terms of Majorana fermions at half-filling on bipartite lattices. This representation suggests a natural O(3)-symmetric trial state that is investigated and characterized as a gapped spin liquid.

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