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    Université de Fribourg

    Long-range orders and spin/orbital freezing in the two-band Hubbard model

    Steiner, Karim ; Hoshino, Shintaro ; Nomura, Yusuke ; Werner, Philipp

    In: Physical Review B, 2016, vol. 94, no. 7, p. 075107

    We solve the orbitally degenerate two-band Hubbard model within dynamical mean field theory and map out the instabilities to various symmetry-broken phases based on an analysis of the corresponding lattice susceptibilities. Phase diagrams as a function of the Hund coupling parameter J are obtained both for the model with rotationally invariant interaction and for the model with Ising-type...

    Université de Fribourg

    Double-expansion impurity solver for multiorbital models with dynamically screened $U$ and $J$

    Steiner, Karim ; Nomura, Yusuke ; Werner, Philipp

    In: Physical Review B, 2015, vol. 92, no. 11, p. 115123

    We present a continuous-time Monte Carlo impurity solver for multiorbital impurity models which combines a strong-coupling hybridization expansion and a weak-coupling expansion in the Hund's coupling parameter J. This double-expansion approach allows to treat the dominant density-density interactions U within the efficient segment representation. We test the approach for a two-orbital model with...