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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2303.04169 |
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| _version_ | 1866929286231883776 |
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| author | Voleti, Sreekar Wandler, F David Paramekanti, Arun |
| author_facet | Voleti, Sreekar Wandler, F David Paramekanti, Arun |
| contents | 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-$Γ$ exchange interactions. We discuss recent experiments on various cobaltate and osmate materials which hint at the ubiquity and importance of this physics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_04169 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions Voleti, Sreekar Wandler, F David Paramekanti, Arun Strongly Correlated Electrons 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-$Γ$ exchange interactions. We discuss recent experiments on various cobaltate and osmate materials which hint at the ubiquity and importance of this physics. |
| title | Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2303.04169 |