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Long-range orders, spin- and orbital-freezing in the two-band Hubbard model | | Karim Steiner
; Shintaro Hoshino
; Yusuke Nomura
; Philipp Werner
; | | Date: |
20 May 2016 | | Abstract: | 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 anisotropy. For negative J, an intra-orbital spin-singlet
superconducting phase appears at low temperatures, while the normal state
properties are characterized by an orbital freezing phenomenon. This is the
negative-J analogue of the recently discovered fluctuating-moment induced
s-wave spin-triplet superconductivity in the spin-freezing regime of
multi-orbital models with J>0. | | Source: | arXiv, 1605.6410 | | Services: | Forum | Review | PDF | Favorites | |
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