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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.01511 |
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| _version_ | 1866912358485458944 |
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| author | Robredo, Iñigo Fang, Yuan Chen, Lei Zaremba, Nazar Prots, Yurii Krnel, Mitja König, Markus Doert, Thomas Brink, Jeroen van den Felser, Claudia Si, Qimiao Svanidze, Eteri Vergniory, Maia G. |
| author_facet | Robredo, Iñigo Fang, Yuan Chen, Lei Zaremba, Nazar Prots, Yurii Krnel, Mitja König, Markus Doert, Thomas Brink, Jeroen van den Felser, Claudia Si, Qimiao Svanidze, Eteri Vergniory, Maia G. |
| contents | Realizing topological phases in strongly correlated materials has become a major impetus in condensed matter physics. Although many compounds are now classified as topological insulators, $f$-electron systems (with their strong electron correlations) provide an especially fertile platform for emergent heavy-fermion phenomena driven by the interplay of topology and many-body effects. In this study, we examine the crystalline topology of a new RAsS series (R = Y, La, Sm), revealing a structural variant from previous reports. We demonstrate that YAsS and SmAsS host hourglass fermions protected by glide symmetry. SmAsS notably exhibits a strong effective-mass enhancement, placing it alongside SmB${}_6$ and YbB${}_{12}$ as a material that couples topological surface states with emergent Kondo physics, yet distinguished by its crystalline symmetry constraints and $f$-$p$ orbital hybridization. To capture these features, we construct a minimal model incorporating $f$-electron degrees of freedom, which reproduces the observed topological properties and predicts that the surface states survive in the correlated regime, albeit shifted in energy. Our work thus introduces a new family of correlated topological materials and forecasts the robustness of their surface states under Kondo correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_01511 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent heavy-fermion physics in a new family of topological insulators RAsS (R = Y, La, and Sm) Robredo, Iñigo Fang, Yuan Chen, Lei Zaremba, Nazar Prots, Yurii Krnel, Mitja König, Markus Doert, Thomas Brink, Jeroen van den Felser, Claudia Si, Qimiao Svanidze, Eteri Vergniory, Maia G. Materials Science Strongly Correlated Electrons Realizing topological phases in strongly correlated materials has become a major impetus in condensed matter physics. Although many compounds are now classified as topological insulators, $f$-electron systems (with their strong electron correlations) provide an especially fertile platform for emergent heavy-fermion phenomena driven by the interplay of topology and many-body effects. In this study, we examine the crystalline topology of a new RAsS series (R = Y, La, Sm), revealing a structural variant from previous reports. We demonstrate that YAsS and SmAsS host hourglass fermions protected by glide symmetry. SmAsS notably exhibits a strong effective-mass enhancement, placing it alongside SmB${}_6$ and YbB${}_{12}$ as a material that couples topological surface states with emergent Kondo physics, yet distinguished by its crystalline symmetry constraints and $f$-$p$ orbital hybridization. To capture these features, we construct a minimal model incorporating $f$-electron degrees of freedom, which reproduces the observed topological properties and predicts that the surface states survive in the correlated regime, albeit shifted in energy. Our work thus introduces a new family of correlated topological materials and forecasts the robustness of their surface states under Kondo correlations. |
| title | Emergent heavy-fermion physics in a new family of topological insulators RAsS (R = Y, La, and Sm) |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.01511 |