Textured electronic states of the triangular lattice Hubbard model and Na$_x$CoO$_2$ near $x=1/3$

  title={Textured electronic states of the triangular lattice Hubbard model and Na\$\_x\$CoO\$\_2\$ near \$x=1/3\$},
  author={Kun Jiang and Sen Zhou and Ziqiang Wang},
  journal={Bulletin of the American Physical Society},
We show that geometric frustration and strong correlation in the triangular-lattice Hubbard model lead a rich phase structure of root 3 x root 3 spin-charge textured electronic states over a wide region of electron doping 0 <= x <= 0.40. In addition to the 120 degrees Neel ordered insulator at half filling, we found a spin charge ordered insulator at x = 1/3 with collinear antiferromagnetic (AF) order on the underlying unfrustrated honeycomb lattice. Separating the two insulating phases is a… 
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