Multicolored quantum dimer models, resonating valence-bond states, color visons, and the triangular-lattice t(2g) spin-orbital system

作者：Normand, B^*

来源：Physical Review B, 2011, 83(6): 064413.

DOI：10.1103/PhysRevB.83.064413

• PHASE

The spin-orbital model for triply degenerate t(2g) electrons on a triangular lattice has been shown to be dominated by dimers. The phase diagram contains both strongly resonating, compound spin-orbital dimer states and quasistatic, spin-singlet valence-bond (VB) states. To elucidate the nature of the true ground state in these different regimes, the model is mapped to a number of quantum dimer models (QDMs), each of which has three dimer colors. The generic multicolored QDM, illustrated for the two-and three-color cases, possesses a topological color structure, "color vison" excitations, and broad regions of resonating VB phases. The specific models are analyzed to gain further insight into the likely ground states in the superexchange and direct-exchange limits of the electronic Hamiltonian, and they suggest a strong tendency toward VB order in all cases.

• 出版日期2011-2-17
• 单位中国人民大学