Signatures of moiré intralayer biexcitons and exciton-phason coupling in WSe2/WS2 heterostructures
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914236266971136 |
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| author | Dalal, Ranju Singh, Harsimran Dutta, Rwik Swaminathan, Hariharan Watanabe, Kenji Taniguchi, Takashi Naik, Mit H Jain, Manish Singh, Akshay |
| author_facet | Dalal, Ranju Singh, Harsimran Dutta, Rwik Swaminathan, Hariharan Watanabe, Kenji Taniguchi, Takashi Naik, Mit H Jain, Manish Singh, Akshay |
| contents | Interactions among electronic and lattice degrees-of-freedom are foundational to various phases in condensed-matter physics, yet the dynamic interplay between excitonic and phononic quasiparticles represents an equivalent, underexplored frontier. Moiré superlattices provide an ideal platform for realizing these interactions by offering localized intralayer excitons (IALX) and ultralow-energy collective lattice modes, such as phasons. Here, by optically suppressing ultrafast charge-transfer (CT) to interlayer excitons in WSe2/WS2 heterostructures, we uncover dynamics of moiré IALX revealing long lifetimes (τ > 1000 ps) arising from localized Wannier and in-plane CT nature. We then observe moiré intralayer intervalley biexcitons with binding energy ~ 16 meV, with long lifetimes due to moiré confinement. Furthermore, we find time-domain signatures of strong coupling between moiré-IALX and ~ 10 micro-eV phasons, evidenced as twist-angle-dependent GHz oscillations in IALX dynamics. Our findings establish moiré superlattices as interacting hybrid quantum systems and for engineering non-equilibrium phenomena, as well as for GHz-scale optoelectronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03045 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Signatures of moiré intralayer biexcitons and exciton-phason coupling in WSe2/WS2 heterostructures Dalal, Ranju Singh, Harsimran Dutta, Rwik Swaminathan, Hariharan Watanabe, Kenji Taniguchi, Takashi Naik, Mit H Jain, Manish Singh, Akshay Mesoscale and Nanoscale Physics Materials Science Interactions among electronic and lattice degrees-of-freedom are foundational to various phases in condensed-matter physics, yet the dynamic interplay between excitonic and phononic quasiparticles represents an equivalent, underexplored frontier. Moiré superlattices provide an ideal platform for realizing these interactions by offering localized intralayer excitons (IALX) and ultralow-energy collective lattice modes, such as phasons. Here, by optically suppressing ultrafast charge-transfer (CT) to interlayer excitons in WSe2/WS2 heterostructures, we uncover dynamics of moiré IALX revealing long lifetimes (τ > 1000 ps) arising from localized Wannier and in-plane CT nature. We then observe moiré intralayer intervalley biexcitons with binding energy ~ 16 meV, with long lifetimes due to moiré confinement. Furthermore, we find time-domain signatures of strong coupling between moiré-IALX and ~ 10 micro-eV phasons, evidenced as twist-angle-dependent GHz oscillations in IALX dynamics. Our findings establish moiré superlattices as interacting hybrid quantum systems and for engineering non-equilibrium phenomena, as well as for GHz-scale optoelectronics. |
| title | Signatures of moiré intralayer biexcitons and exciton-phason coupling in WSe2/WS2 heterostructures |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2601.03045 |