Observation and Control of Moiré-Tailored Topological Dirac States
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866913069152600064 |
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| author | Ganser, R. Masilamani, M. P. T. Geldiyev, B. Hirschmann, M. M. Consiglio, A. Schusser, J. Di Sante, D. Ünzelmann, M. Reinert, F. |
| author_facet | Ganser, R. Masilamani, M. P. T. Geldiyev, B. Hirschmann, M. M. Consiglio, A. Schusser, J. Di Sante, D. Ünzelmann, M. Reinert, F. |
| contents | Moiré heterostructures provide a powerful framework for tailoring electronic band structures via controlled long-range periodic superlattice potentials. Beyond widely studied moiré-tailored flat bands, folded band structures can host emergent Dirac states, which have recently attracted considerable interest. Direct momentum-resolved observation of gapless moiré-Dirac quasiparticles, however, is challenging and has so far remained elusive. By performing angle-resolved photoemission spectroscopy measurements on an epitaxial surface-moiré structure, we here provide direct spectroscopic evidence of moiré-dressed Dirac states with topological character. Driven by the one-dimensional superlattice potential, electrons propagate anisotropically with a weak but massless Dirac dispersion along the confinement direction. The observed band crossings belong to topological nodal lines pinned to the mini-Brillouin zone boundaries. As such, they are enforced and robustly protected by the non-symmorphic symmetry of the superlattice. Finally, we demonstrate that the topological excitations can be almost continuously controlled by tuning the moiré lattice periodicity, directly unveiling moiré heterostructures as a promising platform for creating and controlling topological moiré-Dirac states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25598 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation and Control of Moiré-Tailored Topological Dirac States Ganser, R. Masilamani, M. P. T. Geldiyev, B. Hirschmann, M. M. Consiglio, A. Schusser, J. Di Sante, D. Ünzelmann, M. Reinert, F. Strongly Correlated Electrons Materials Science Moiré heterostructures provide a powerful framework for tailoring electronic band structures via controlled long-range periodic superlattice potentials. Beyond widely studied moiré-tailored flat bands, folded band structures can host emergent Dirac states, which have recently attracted considerable interest. Direct momentum-resolved observation of gapless moiré-Dirac quasiparticles, however, is challenging and has so far remained elusive. By performing angle-resolved photoemission spectroscopy measurements on an epitaxial surface-moiré structure, we here provide direct spectroscopic evidence of moiré-dressed Dirac states with topological character. Driven by the one-dimensional superlattice potential, electrons propagate anisotropically with a weak but massless Dirac dispersion along the confinement direction. The observed band crossings belong to topological nodal lines pinned to the mini-Brillouin zone boundaries. As such, they are enforced and robustly protected by the non-symmorphic symmetry of the superlattice. Finally, we demonstrate that the topological excitations can be almost continuously controlled by tuning the moiré lattice periodicity, directly unveiling moiré heterostructures as a promising platform for creating and controlling topological moiré-Dirac states. |
| title | Observation and Control of Moiré-Tailored Topological Dirac States |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2604.25598 |