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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.19490 |
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| _version_ | 1866910847405654016 |
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| author | Devenica, Luka Matej Hadjri, Zach Kumlin, Jan Li, Runtong Li, Weijie Forrero, Daniel Suarez Vento, Valeria Ubrig, Nicolas Liu, Song Hone, James Watanabe, Kenji Taniguchi, Takashi Pohl, Thomas Srivastava, Ajit |
| author_facet | Devenica, Luka Matej Hadjri, Zach Kumlin, Jan Li, Runtong Li, Weijie Forrero, Daniel Suarez Vento, Valeria Ubrig, Nicolas Liu, Song Hone, James Watanabe, Kenji Taniguchi, Takashi Pohl, Thomas Srivastava, Ajit |
| contents | Spontaneous symmetry breaking, arising from the competition of interactions and quantum fluctuations, is fundamental to understanding ordered electronic phases. Although electrically neutral, optical excitations like excitons can interact through their dipole moment, raising the possibility of optically active ordered phases. The effects of spontaneous ordering on optical properties remain largely unexplored. Recent observations of the excitonic Mott insulating state in semiconducting moiré crystals make them promising for addressing this question. Here, we present evidence for an in-plane ferroelectric phase of dipolar moiré excitons driven by strong exciton-exciton interactions. We discover a surprising speed-up of photon emission at late times and low densities in excitonic decay. This counterintuitive behavior is attributed to collective radiance, linked to the transition between disordered and symmetry-broken ferroelectric phases of moiré excitons. Our findings provide first evidence for strong dipolar inter-site interactions in moiré lattices, demonstrate collective photon emission as a probe for moiré quantum materials, and pave the way for exploring cooperative optical phenomena in strongly correlated systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19490 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Signatures of collective photon emission and ferroelectric ordering of excitons near their Mott insulating state in a WSe$_2$/WS$_2$ heterobilayer Devenica, Luka Matej Hadjri, Zach Kumlin, Jan Li, Runtong Li, Weijie Forrero, Daniel Suarez Vento, Valeria Ubrig, Nicolas Liu, Song Hone, James Watanabe, Kenji Taniguchi, Takashi Pohl, Thomas Srivastava, Ajit Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics Spontaneous symmetry breaking, arising from the competition of interactions and quantum fluctuations, is fundamental to understanding ordered electronic phases. Although electrically neutral, optical excitations like excitons can interact through their dipole moment, raising the possibility of optically active ordered phases. The effects of spontaneous ordering on optical properties remain largely unexplored. Recent observations of the excitonic Mott insulating state in semiconducting moiré crystals make them promising for addressing this question. Here, we present evidence for an in-plane ferroelectric phase of dipolar moiré excitons driven by strong exciton-exciton interactions. We discover a surprising speed-up of photon emission at late times and low densities in excitonic decay. This counterintuitive behavior is attributed to collective radiance, linked to the transition between disordered and symmetry-broken ferroelectric phases of moiré excitons. Our findings provide first evidence for strong dipolar inter-site interactions in moiré lattices, demonstrate collective photon emission as a probe for moiré quantum materials, and pave the way for exploring cooperative optical phenomena in strongly correlated systems. |
| title | Signatures of collective photon emission and ferroelectric ordering of excitons near their Mott insulating state in a WSe$_2$/WS$_2$ heterobilayer |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2502.19490 |