Förster valley-orbit coupling and topological lattice of hybrid moiré excitons
Abstract Hybrid excitons in moiré superlattices of two-dimensional (2D) semiconductors inherit the electric dipole, strong moiré trapping, and stacking optical selection rules from its interlayer part, whereas the intralayer part is intended for enhancing optical coupling strength. Here, we show tha...
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Nature Portfolio
2025-05-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-02114-0 |
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| author | Huiyuan Zheng Ci Li Hongyi Yu Wang Yao |
| author_facet | Huiyuan Zheng Ci Li Hongyi Yu Wang Yao |
| author_sort | Huiyuan Zheng |
| collection | DOAJ |
| description | Abstract Hybrid excitons in moiré superlattices of two-dimensional (2D) semiconductors inherit the electric dipole, strong moiré trapping, and stacking optical selection rules from its interlayer part, whereas the intralayer part is intended for enhancing optical coupling strength. Here, we show that electron-hole Coulomb exchange, or Förster type multipole-multipole coupling, in the intralayer component qualitatively alters the properties of moiré excitons, enabling their coherent hopping between moiré traps laterally separated over 10 nm and/or across layers, where their kinetic propagation is completely suppressed. Valley-flip hopping channels are found as significant as the valley-conserving ones, leading to rich possibilities to tailor valley-orbit-couplings and introduce non-trivial topology to the moiré exciton superlattice. In twisted MoTe2 where hybrid moiré excitons feature a symmetry protection from radiative recombination, we show that Förster valley-orbit-coupling can give rise to a rich topological phase diagram. |
| format | Article |
| id | doaj-art-d073f9b3b48d4489bea2983c51d62425 |
| institution | OA Journals |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-d073f9b3b48d4489bea2983c51d624252025-08-20T01:49:44ZengNature PortfolioCommunications Physics2399-36502025-05-01811610.1038/s42005-025-02114-0Förster valley-orbit coupling and topological lattice of hybrid moiré excitonsHuiyuan Zheng0Ci Li1Hongyi Yu2Wang Yao3New Cornerstone Science Laboratory, Department of Physics, University of Hong KongSchool of Physics and Electronics, Hunan UniversitySchool of Physics and Astronomy, Sun Yat-sen University (Zhuhai Campus)New Cornerstone Science Laboratory, Department of Physics, University of Hong KongAbstract Hybrid excitons in moiré superlattices of two-dimensional (2D) semiconductors inherit the electric dipole, strong moiré trapping, and stacking optical selection rules from its interlayer part, whereas the intralayer part is intended for enhancing optical coupling strength. Here, we show that electron-hole Coulomb exchange, or Förster type multipole-multipole coupling, in the intralayer component qualitatively alters the properties of moiré excitons, enabling their coherent hopping between moiré traps laterally separated over 10 nm and/or across layers, where their kinetic propagation is completely suppressed. Valley-flip hopping channels are found as significant as the valley-conserving ones, leading to rich possibilities to tailor valley-orbit-couplings and introduce non-trivial topology to the moiré exciton superlattice. In twisted MoTe2 where hybrid moiré excitons feature a symmetry protection from radiative recombination, we show that Förster valley-orbit-coupling can give rise to a rich topological phase diagram.https://doi.org/10.1038/s42005-025-02114-0 |
| spellingShingle | Huiyuan Zheng Ci Li Hongyi Yu Wang Yao Förster valley-orbit coupling and topological lattice of hybrid moiré excitons Communications Physics |
| title | Förster valley-orbit coupling and topological lattice of hybrid moiré excitons |
| title_full | Förster valley-orbit coupling and topological lattice of hybrid moiré excitons |
| title_fullStr | Förster valley-orbit coupling and topological lattice of hybrid moiré excitons |
| title_full_unstemmed | Förster valley-orbit coupling and topological lattice of hybrid moiré excitons |
| title_short | Förster valley-orbit coupling and topological lattice of hybrid moiré excitons |
| title_sort | forster valley orbit coupling and topological lattice of hybrid moire excitons |
| url | https://doi.org/10.1038/s42005-025-02114-0 |
| work_keys_str_mv | AT huiyuanzheng forstervalleyorbitcouplingandtopologicallatticeofhybridmoireexcitons AT cili forstervalleyorbitcouplingandtopologicallatticeofhybridmoireexcitons AT hongyiyu forstervalleyorbitcouplingandtopologicallatticeofhybridmoireexcitons AT wangyao forstervalleyorbitcouplingandtopologicallatticeofhybridmoireexcitons |