A diagonal 2-orbital ladder model for the Fe based superconductors

ORAL

Abstract

We study a diagonal 2-orbital ladder model for the Fe based superconductors using the density matrix renormalization group method. The diagonal geometry treats the $x$ and $y$ directions symmetrically, and therefore it is particularly suitable for addressing some of the outstanding problems of the field, such as nematic order and the competition between A$_{1,g}$ and B$_{1,g} $ pairing symmetries. At half filling, we find a close competition between a ``spin-striped'' state and a non-collinear ``spin-checkerboard'' state, as well as significant nematic correlations. Upon finite hole or electron doping, the dominant pairing correlations are found to have A$_{1,g}$ ($S-$wave) symmetry.

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Authors

  • Erez Berg

    • Department of Physics, Harvard University, Cambridge, MA 02138, USA
    • Harvard University
    • Dept. of Physics, Harvard University

  • Steven Kivelson

    • Stanford University

  • Douglas Scalapino

    • University of California, Santa Barbara