2013/09/30 by Kun Jiang, Sen Zhou, Ziqiang Wang · 14 citations
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Algorithm #Mathematics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.90.165135
published in Physical Review B 90(16) (American Physical Society) · 5 pages, 5 figures. Final version, to be published in PRB
openalex publication_date 2014/10/27 · arxiv created 2014/11/03 · arxiv updated 2014/11/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We show that geometric frustration and strong correlation in the triangular-lattice Hubbard model lead a rich phase structure of √(3)\ifmmode×\else\texttimes\fi√(3) spin-charge textured electronic states over a wide region of electron doping 0\ensuremath≤x\ensuremath≤0.40. In addition to the 120^\ensuremath∘ N'eel 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 Lifshitz transition between a noncollinear AF ordered metal and one with coexisting charge order. We obtain the phase diagram and the evolution of the Fermi surface (FS). Remarkably, the correlated ground states near x=1/3 emerge as doping the ``1/3 AF insulator'' by excess carriers, leading to electron and hole FS pockets with important implications for the cobaltate superconducting state.