Dispersive nodal fermions along grain boundaries in Floquet topological crystals
Abstract Driven quantum materials often feature emergent topology, otherwise absent in static crystals. Dynamic bulk-boundary correspondence, encoded by nondissipative gapless modes residing near the Floquet zone center and/or boundaries, is its most prominent example. Here we show that topologicall...
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Nature Portfolio
2025-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-83573-3 |
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| author | Daniel J. Salib Bitan Roy |
| author_facet | Daniel J. Salib Bitan Roy |
| author_sort | Daniel J. Salib |
| collection | DOAJ |
| description | Abstract Driven quantum materials often feature emergent topology, otherwise absent in static crystals. Dynamic bulk-boundary correspondence, encoded by nondissipative gapless modes residing near the Floquet zone center and/or boundaries, is its most prominent example. Here we show that topologically robust gapless dispersive modes appear along the grain boundaries, embedded in the interior of Floquet topological crystals, when the Floquet-Bloch band inversion occurring at a finite momentum ( $$\textbf{K}^\textrm{Flq}_\textrm{inv}$$ K inv Flq ) and the Burgers vector ( $$\textbf{b}$$ b ) of the constituting array of dislocations satisfy $$\textbf{K}^\textrm{Flq}_\textrm{inv} \cdot \textbf{b}=\pi$$ K inv Flq · b = π (modulo $$2 \pi$$ 2 π ). Such nondissipative gapless states can be found near the center and/or edges of the Floquet Brillouin zone, irrespective of the drive protocol. We showcase these general outcomes for two-dimensional driven time-reversal symmetry breaking insulators. Promising experimental platforms hosting such dynamic topological dispersive bands in real materials are discussed. |
| format | Article |
| id | doaj-art-094d963e957f431fb5d48da735890576 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-094d963e957f431fb5d48da7358905762025-01-19T12:18:53ZengNature PortfolioScientific Reports2045-23222025-01-0115111110.1038/s41598-024-83573-3Dispersive nodal fermions along grain boundaries in Floquet topological crystalsDaniel J. Salib0Bitan Roy1Department of Physics, Lehigh UniversityDepartment of Physics, Lehigh UniversityAbstract Driven quantum materials often feature emergent topology, otherwise absent in static crystals. Dynamic bulk-boundary correspondence, encoded by nondissipative gapless modes residing near the Floquet zone center and/or boundaries, is its most prominent example. Here we show that topologically robust gapless dispersive modes appear along the grain boundaries, embedded in the interior of Floquet topological crystals, when the Floquet-Bloch band inversion occurring at a finite momentum ( $$\textbf{K}^\textrm{Flq}_\textrm{inv}$$ K inv Flq ) and the Burgers vector ( $$\textbf{b}$$ b ) of the constituting array of dislocations satisfy $$\textbf{K}^\textrm{Flq}_\textrm{inv} \cdot \textbf{b}=\pi$$ K inv Flq · b = π (modulo $$2 \pi$$ 2 π ). Such nondissipative gapless states can be found near the center and/or edges of the Floquet Brillouin zone, irrespective of the drive protocol. We showcase these general outcomes for two-dimensional driven time-reversal symmetry breaking insulators. Promising experimental platforms hosting such dynamic topological dispersive bands in real materials are discussed.https://doi.org/10.1038/s41598-024-83573-3 |
| spellingShingle | Daniel J. Salib Bitan Roy Dispersive nodal fermions along grain boundaries in Floquet topological crystals Scientific Reports |
| title | Dispersive nodal fermions along grain boundaries in Floquet topological crystals |
| title_full | Dispersive nodal fermions along grain boundaries in Floquet topological crystals |
| title_fullStr | Dispersive nodal fermions along grain boundaries in Floquet topological crystals |
| title_full_unstemmed | Dispersive nodal fermions along grain boundaries in Floquet topological crystals |
| title_short | Dispersive nodal fermions along grain boundaries in Floquet topological crystals |
| title_sort | dispersive nodal fermions along grain boundaries in floquet topological crystals |
| url | https://doi.org/10.1038/s41598-024-83573-3 |
| work_keys_str_mv | AT danieljsalib dispersivenodalfermionsalonggrainboundariesinfloquettopologicalcrystals AT bitanroy dispersivenodalfermionsalonggrainboundariesinfloquettopologicalcrystals |