Emergent topological magnetism in Hund's excitonic insulator
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2024
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| author | Okuma, R. Yamagami, K. Fujisawa, Y. Hsu, C. H. Obata, Y. Tomoda, N. Dronova, M. Kuroda, K. Ishikawa, H. Kawaguchi, K. Aido, K. Kindo, K. Chan, Y. H. Lin, H. Ihara, Y. Kondo, T. Okada, Y. |
| author_facet | Okuma, R. Yamagami, K. Fujisawa, Y. Hsu, C. H. Obata, Y. Tomoda, N. Dronova, M. Kuroda, K. Ishikawa, H. Kawaguchi, K. Aido, K. Kindo, K. Chan, Y. H. Lin, H. Ihara, Y. Kondo, T. Okada, Y. |
| contents | Analogous to the charged electron-electron pair condensation in superconductors, an excitonic insulator (EI) represents Fermi surface instability due to spontaneous formation and condensation of charge-neutral electron-hole pair (exciton). Unlike in superconductors, however, the charge-neutral nature of exciton makes probing emergent EI phase via macroscopic physical properties generally difficult. Here, we propose a van der Waals coupled antiferromagnetic semiconductor GdGaI (GGI) as a new material category leading to emergent multi-q magnet intertwined with spontaneous exciton formation/condensation. Before excitonic band hybridization, a simple picture for the parent electronic state consists of electron (Gd-derived 5d) and hole (Ga-derived 4p) delocalized bands, together with Gd-derived 4f localized antiferromagnets with S = 7/2 classical nature. Through intra Gd atom 4f-5d Hund's coupling, a notable finding is the emergent minimum length scale (2a) Skyrmion-like spin texture resulting from spontaneous condensation/formation of spin-polarized exciton with BCS-BEC crossover phenomenology. This discovered platform is promising for realizing valuable quantum matter on the nanoscale; our finding will provide significant insight into designing the atomic scale topological magnetism out of itinerant systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_16781 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Emergent topological magnetism in Hund's excitonic insulator Okuma, R. Yamagami, K. Fujisawa, Y. Hsu, C. H. Obata, Y. Tomoda, N. Dronova, M. Kuroda, K. Ishikawa, H. Kawaguchi, K. Aido, K. Kindo, K. Chan, Y. H. Lin, H. Ihara, Y. Kondo, T. Okada, Y. Strongly Correlated Electrons Materials Science Analogous to the charged electron-electron pair condensation in superconductors, an excitonic insulator (EI) represents Fermi surface instability due to spontaneous formation and condensation of charge-neutral electron-hole pair (exciton). Unlike in superconductors, however, the charge-neutral nature of exciton makes probing emergent EI phase via macroscopic physical properties generally difficult. Here, we propose a van der Waals coupled antiferromagnetic semiconductor GdGaI (GGI) as a new material category leading to emergent multi-q magnet intertwined with spontaneous exciton formation/condensation. Before excitonic band hybridization, a simple picture for the parent electronic state consists of electron (Gd-derived 5d) and hole (Ga-derived 4p) delocalized bands, together with Gd-derived 4f localized antiferromagnets with S = 7/2 classical nature. Through intra Gd atom 4f-5d Hund's coupling, a notable finding is the emergent minimum length scale (2a) Skyrmion-like spin texture resulting from spontaneous condensation/formation of spin-polarized exciton with BCS-BEC crossover phenomenology. This discovered platform is promising for realizing valuable quantum matter on the nanoscale; our finding will provide significant insight into designing the atomic scale topological magnetism out of itinerant systems. |
| title | Emergent topological magnetism in Hund's excitonic insulator |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2405.16781 |