Exact ground states of the extended Hubbard model on the Kagomé lattice

Masaaki Nakamura and Satoshi Nishimoto ()
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Masaaki Nakamura: Ehime University
Satoshi Nishimoto: Technical University Dresden

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 9, 1-11

Abstract: Abstract We discuss the exact plaquette-ordered ground states of the generalized Hubbard model on the Kagomé lattice for several fillings, by constructing the Hamiltonian as a sum of products of projection operators for up and down spin sectors. The obtained exact ground states are interpreted as Néel ordered states on the bond-located electrons. We determine several parameter regions of the exact ground states, and calculate the entanglement entropy. We examine the above results by numerical calculations based on exact diagonalization and density-matrix renormalization group methods.

Date: 2018
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DOI: 10.1140/epjb/e2018-90352-9

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