Ground-state phase diagram of the repulsive SU(3) Hubbard model in the Gutzwiller approximation

Ákos Rapp and Achim Rosch
Phys. Rev. A 83, 053605 – Published 3 May 2011

Abstract

We perform a variational Gutzwiller calculation to study the ground state of the repulsive SU(3) Hubbard model on the Bethe lattice with infinite coordination number. We construct a ground-state phase diagram focusing on phases with a two-sublattice structure and find five relevant phases: (1) a paramagnet, (2) a completely polarized ferromagnet, (3) a two-component antiferromagnet where the third component is depleted, (4) a two-component antiferromagnet with a metallic third component (an “orbital selective” Mott insulator), and (5) a density-wave state where two components occupy dominantly one sublattice and the last component the other one. First-order transitions between these phases lead to phase separation. A comparison of the SU(3) Hubbard model to the better-known SU(2) model shows that the effects of doping are completely different in the two cases.

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  • Received 17 February 2011

DOI:https://doi.org/10.1103/PhysRevA.83.053605

©2011 American Physical Society

Authors & Affiliations

Ákos Rapp and Achim Rosch

  • Institut für Theoretische Physik, Universität zu Köln, D-50937 Köln, Germany

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Vol. 83, Iss. 5 — May 2011

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