Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-02-15
Physical Review A 83, 053605 (2011)
Physics
Condensed Matter
Quantum Gases
12 pages, 6 figures, content equivalent to journal version
Scientific paper
10.1103/PhysRevA.83.053605
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.
Rapp Akos
Rosch Achim
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