Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866915035104673792 |
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| author | Fragkopoulou, Georgia Vojta, Matthias |
| author_facet | Fragkopoulou, Georgia Vojta, Matthias |
| contents | We study the effect of bond disorder in extended Heisenberg-Kitaev models on the honeycomb lattice, relevant for materials such as $α$-RuCl$_3$, in the semiclassical limit using a combination of T-matrix and real-space spin-wave approaches. Focusing on the regime of large applied magnetic field, we discuss two distinct but related disorder-induced phenomena, namely spin textures in the vicinity of isolated impurities and magnetic excitations below the bulk gap. A finite impurity concentration smears the field-tuned phase transition and turns the isolated in-gap states into impurity bands. As a result, there is a large field regime above the bulk transition into the high-field phase where impurity-induced states fill the bulk spin gap. We illustrate the field dependence of these in-gap states for parameters relevant for $α$-RuCl$_3$, and we connect our results to heat-transport and NMR data which indicated their presence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_12656 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime Fragkopoulou, Georgia Vojta, Matthias Strongly Correlated Electrons We study the effect of bond disorder in extended Heisenberg-Kitaev models on the honeycomb lattice, relevant for materials such as $α$-RuCl$_3$, in the semiclassical limit using a combination of T-matrix and real-space spin-wave approaches. Focusing on the regime of large applied magnetic field, we discuss two distinct but related disorder-induced phenomena, namely spin textures in the vicinity of isolated impurities and magnetic excitations below the bulk gap. A finite impurity concentration smears the field-tuned phase transition and turns the isolated in-gap states into impurity bands. As a result, there is a large field regime above the bulk transition into the high-field phase where impurity-induced states fill the bulk spin gap. We illustrate the field dependence of these in-gap states for parameters relevant for $α$-RuCl$_3$, and we connect our results to heat-transport and NMR data which indicated their presence. |
| title | Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.12656 |