Parent Phases of Doped Mott Insulators: A Cluster DMFT Study

Details Parent Phases of Doped Mott Insulators: A Cluster DMFT Study Parent Phases of Doped Mott Insulators: A Cluster DMFT Study

2008-08-18

arxiv.org/abs/0808.2328v1

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Phys. Rev. Lett

Scientific paper

We investigate the insulating phases of a frustrated Hubbard model in its strong coupling regime at half-filling. We pay special attention to all the symmetry breaking instabilities that can be described by Dynamical Mean Field Theory (DMFT) on a square plaquette. We identify several mean-field solutions, two Neel states breaking the SU(2) symmetry, a dimer phase and a Mott insulator which doesn't break any symmetry. The singlet to singlet fluctuations soften dramatically in the latter phase, giving rise to dimerization fluctuations as well as chiral fluctuations that are both low-lying. We present a simple picture of the different DMFT states and their evolution with frustration.

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