Electronic Properties of the Hubbard Model on a Frustrated Triangular Lattice

Abstract

We study novel electronic properties of the Hubbard model on a triangular lattice using the cellular dynamical mean-field theory. The interplay of strong geometric frustration and electron correlations causes a Mott transition at the Hubbard interaction $U/t=10.5$ and an unusual suppression of low energy spin excitations. Doping of a triangular Mott insulator leads to a quasiparticle peak (no pseudogap) at the Fermi surface and to an unexpected increase of low energy spin excitations, in stark contrast to the unfrustrated square lattice case. The present results give much insight into strongly frustrated electronic systems. A few predictions are made.

arXiv comment5 pages, 6 figues

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• Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates
• Multisite versus multiorbital Coulomb correlations studied within finite-temperature exact diagonalization dynamical mean-field theory
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• WSe2/WS2 moiré superlattices: a new Hubbard model simulator
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• Not all doped Mott insulators have a pseudogap: key role of van Hove singularities
• Character of frustration on magnetic correlation in doped Hubbard model