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Exotic Cooper pairing in multi-orbital models of Sr$_2$RuO$_4$ | | Wen Huang
; Yi Zhou
; Hong Yao
; | | Date: |
9 May 2019 | | Abstract: | The unconventional superconductivity in Sr$_2$RuO$_4$ continues to defy a
unified interpretation. In this paper, we focus on some novel aspects of its
superconducting pairing by exploiting the orbital degree of freedom in this
material. The multi-orbital nature, combined with the symmetry of the orbitals
involved, leads to a plethora of exotic Cooper pairings not accessible in
single-orbital systems. In the presence of finite spin-orbit coupling (SOC),
spin-singlet and spin-triplet pairings are entangled, thus the spin
susceptibility is generically expected to be suppressed below $T_c$. Essential
physics is illustrated first using a two-orbital model with $d_{xz}$- and
$d_{yz}$-orbitals. We classify the gap functions according to the underlying
lattice symmetries, analyze the effective theories of a few representative
pairings, and make connections to Sr$_2$RuO$_4$ in the course. For
completeness, the classification is generalized to the three-orbital model
involving the $d_{xy}$-orbital as well. The orbital-basis approach
distinguishes from the itinerant-band description for Sr$_2$RuO$_4$, and hence
offers an alternative perspective to investigate its enigmatic superconducting
state. | | Source: | arXiv, 1905.3523 | | Services: | Forum | Review | PDF | Favorites | |
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