Real-Space Switching of Local Moments Driven by Quantum Geometry in Correlated Graphene Heterostructures
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910004676657152 |
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| author | Witt, Niklas Ryee, Siheon Klebl, Lennart Cano, Jennifer Sangiovanni, Giorgio Wehling, Tim O. |
| author_facet | Witt, Niklas Ryee, Siheon Klebl, Lennart Cano, Jennifer Sangiovanni, Giorgio Wehling, Tim O. |
| contents | Graphene-based multilayer systems serve as versatile platforms for exploring the interplay between electron correlation and topology, thanks to distinctive low-energy bands marked by significant quantum metric and Berry curvature from graphene's Dirac bands. Here, we investigate Mott physics and local spin moments in Dirac bands hybridized with a flat band of localized orbitals in functionalized graphene. Via hybridization control, a topological transition is realized between two symmetry-distinct site-selective Mott states featuring local moments in different Wyckoff positions, with a geometrically enforced metallic state emerging in between. We find that this geometrically controlled real-space switching of local moments and associated metal-insulator physics may be realized through proximity coupling of epitaxial graphene on SiC(0001) with group IV intercalants, where the Mott state faces geometrical obstruction in the large-hybridization limit. Our work shows that chemically functionalized graphene provides a correlated electron platform, very similar to the topological heavy fermions in graphene moiré systems but at significantly enhanced characteristic energy scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03700 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-Space Switching of Local Moments Driven by Quantum Geometry in Correlated Graphene Heterostructures Witt, Niklas Ryee, Siheon Klebl, Lennart Cano, Jennifer Sangiovanni, Giorgio Wehling, Tim O. Strongly Correlated Electrons Mesoscale and Nanoscale Physics Graphene-based multilayer systems serve as versatile platforms for exploring the interplay between electron correlation and topology, thanks to distinctive low-energy bands marked by significant quantum metric and Berry curvature from graphene's Dirac bands. Here, we investigate Mott physics and local spin moments in Dirac bands hybridized with a flat band of localized orbitals in functionalized graphene. Via hybridization control, a topological transition is realized between two symmetry-distinct site-selective Mott states featuring local moments in different Wyckoff positions, with a geometrically enforced metallic state emerging in between. We find that this geometrically controlled real-space switching of local moments and associated metal-insulator physics may be realized through proximity coupling of epitaxial graphene on SiC(0001) with group IV intercalants, where the Mott state faces geometrical obstruction in the large-hybridization limit. Our work shows that chemically functionalized graphene provides a correlated electron platform, very similar to the topological heavy fermions in graphene moiré systems but at significantly enhanced characteristic energy scales. |
| title | Real-Space Switching of Local Moments Driven by Quantum Geometry in Correlated Graphene Heterostructures |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.03700 |