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Monte Carlo study of cuprate superconductors in a four-band - model: Role of orbital degrees of freedom
Hiroshi Watanabe, Tomonori Shirakawa, Kazuhiro Seki +4
Understanding the complex phase diagram of cuprate superconductors is a long-standing challenging problem. Recent studies have shown that orbital degrees of freedom, both Cu …
Unified description of cuprate superconductors using four-band - model
Hiroshi Watanabe, Tomonori Shirakawa, Kazuhiro Seki +4
In the 35 years since the discovery of cuprate superconductors, we have not yet reached a unified understanding of their properties, including their material dependence of the supe…
Effect of on-site Coulomb repulsion on ferromagnetic fluctuations in heavily over-doped cuprates
Shingo Teranishi, Kazutaka Nishiguchi, Seiji Yunoki +1
We theoretically study ferromagnetic (FM) fluctuations that are experimentally observed in the heavily overdoped region of cuprate superconductors. To explore the origin of FM fluc…
Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach
Kazutaka Nishiguchi, Tomonori Shirakawa, Hiroshi Watanabe +2
We study possible superconductivity in a carrier-doped iridium oxide insulator SrIrO based on an effective three-orbital Hubbard model on the square lattice wi…
Mechanism of superconductivity and electron-hole doping asymmetry in -type molecular conductors
Hiroshi Watanabe, Hitoshi Seo, Seiji Yunoki
Unconventional superconductivity in molecular conductors is observed at the border of metal-insulator transitions in correlated electrons under the influence of geometrical frustra…
Phase Competition and Superconductivity in -(BEDT-TTF)X: Importance of Intermolecular Coulomb Interactions
Hiroshi Watanabe, Hitoshi Seo, Seiji Yunoki
We theoretically study the competition among different electronic phases in molecular conductors -(BEDT-TTF)X. The ground-state properties of a 3/4-filled extended Hubbard m…
Magnetization induced by odd-frequency spin-triplet Cooper pairs in a Josephson junction with metallic trilayers
S. Hikino, S. Yunoki
We theoretically study the magnetization inside a normal metal induced in an s-wave superconductor/ferromagnetic metal/normal metal/ferromagnetic metal/s-wave superconductor (S/F1/…
0- transition driven by magnetic proximity effect in a Josephson junction
Shin-ichi Hikino, Seiji Yunoki
We theoretically study the Josephson effect in a superconductor/normal metal/superconductor ({\it S}/{\it N}/{\it S}) Josephson junction composed of -wave {\it S}s with {\it N}…
Long-range spin current driven by superconducting phase difference in a Josephson junction with double layer ferromagnets
S. Hikino, S. Yunoki
We theoretically study spin current through ferromagnet (F) in a Josephson junction composed of s-wave superconductors and two layers of ferromagnets. Using quasiclassical theory,…
Monte Carlo study of an unconventional superconducting phase in Ir-oxide J_{eff}=1/2 Mott insulators induced by carrier doping
Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki
Based on a microscopic theoretical study, we show that novel superconductivity is induced by carrier doping in layered perovskite Ir oxides where a strong spin-orbit coupling cause…
Anomalous enhancement of spin Hall conductivity in superconductor/normal metal junction
S. Hikino, S. Yunoki
We propose a spin Hall device to induce a large spin Hall effect in a superconductor/normal metal (SN) junction. The side jump and skew scattering mechanisms are both taken into ac…
Coherent Inverse Photoemission Spectrum for Gutzwiller Projected Superconductors
Seiji Yunoki
Rigorous relations for Gutzwiller projected BCS states are derived. The obtained results do not depend on the details of model systems, but solely on the wave functions. Based on t…
Optical Conductivity and Resistivity of a Hole Doped Spin-Fermion Model for Cuprates
M. Morgaghebi, S. Yunoki, A. Moreo
The optical conductivity and Drude weight of a Spin-Fermion model for cuprates are studied as a function of electronic density and temperature. This model develops stripes and robu…
Robust D-wave Pairing Correlations in a Hole-Doped Spin-Fermion Model for Cuprates
M. Moraghebi, S. Yunoki, A. Moreo
Pairing Correlations are studied numerically in the hole-doped spin-fermion model for cuprates. Simulations performed on up to 12x12 clusters provide robust indications of D-wave s…
Fermi Surface and Spectral Functions of a Hole Doped Spin-Fermion Model for Cuprates
M. Moraghebi, C. Buhler, S. Yunoki +1
Using numerical techniques we study the spectral function of a spin-fermion model for cuprates in the regime where magnetic and charge domains (stripes) are developed upon…