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Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions
- Source :
- Phys. Rev. B 109, 094423 (2024)
- Publication Year :
- 2023
-
Abstract
- The quest for exotic quantum magnetic ground states, including the Kitaev spin liquid and quantum spin-ices, has led to the discovery of several quantum materials where low energy pseudospin-$1/2$ doublets arise from the splitting of spin-orbit entangled multiplets with higher degeneracy. Such systems include $d$-orbital and $f$-orbital Mott insulators. When the gap between the low energy pseudospin-$1/2$ levels and the excited levels of the multiplet or `excitons' is not large, the effective low-energy exchange interactions between the low energy pseudospin-$1/2$ moments can acquire significant corrections from coupling to the excitons. We extract these corrections using higher order perturbation theory as well as an exact Schrieffer-Wolff transformation. Such corrections can impact the exchange matrix for the low energy pseudospin-$1/2$ levels by renormalizing the strength and the sign of Heisenberg exchange or Ising anisotropies, and potentially even inducing bond-anisotropic couplings such as Kitaev-$\Gamma$ exchange interactions. We discuss recent experiments on various cobaltate and osmate materials which hint at the ubiquity and importance of this physics.<br />Comment: 15 pages, 6 figures
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 109, 094423 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2303.04169
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.109.094423