Exact diagonalization studies on two-band minimal model for iron-based superconductors |
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Authors: | M. Okumura N. Nakai H. Nakamura N. Hayashi S. Yamada M. Machida |
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Affiliation: | aCCSE, Japan Atomic Energy Agency, 6-9-3 Higashi-Ueno, Taito-ku, Tokyo 110-0015, Japan;bCREST (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;cJST, TRIP, Sambancho Chiyoda-ku, Tokyo 102-0075, Japan |
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Abstract: | In order to explore a superconducting mechanism on iron-based superconductors, we numerically study a two-band minimal model considering two degenerate dxz and dyz orbitals on Fe atom. We perform exact diagonalization on a two-band and two-leg square ladder totally composed of 10 lattice sites, which is computationally equivalent to 4-leg 20-sites square-Hubbard-ladder. Consequently, we find that a robust pairing occurs in a wide parameter range when the intra-orbital repulsive interaction becomes smaller than the inter-orbital one. Moreover, the obtained binding energy can grow into much larger value than that obtained in the single band Hubbard model depending on the parameter range. |
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Keywords: | Iron-based superconductors Two-bands Hubbard model Exact diagonalization Binding energy |
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