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      Kagome Lattice Hubbard model at half filling

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          Abstract

          We investigate the Kagome lattice Hubbard model at half-filling by variational Monte-Carlo with testing the U(1)-Dirac spin liquid, uniform and valence bond crystal states. Even for the large-\(U\) case the U(1) Dirac state, being the optimal state in the Heisenberg model, cannot be recovered. While the finite \(U\) Hubbard model allows the introduction of vacancies in a different manner compared to the \(t-J\) model, the physics appears to have many similarities. In particular a valence bond crystal is formed in the intermediate-\(U\) regime. We observe an impact of the formation of this valence bond crystal on a possible Mott-transition in this model and discuss the properties of the wave-function.

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          Journal
          26 February 2014
          2014-07-22
          Article
          10.1103/PhysRevB.90.08115
          1402.6612

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          Phys. Rev B 90, 081105(R) (2014)
          extensive revision
          cond-mat.str-el

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