Anomalous valley Hall dynamics of exciton-polaritons
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915746812002304 |
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| author | Chen, Xingzhou Guan, Yuanjun Ghazaryan, Areg Sun, Shiran Yu, Lingxiao Lv, Ruitao Volosniev, Artem Sun, Zheng Wu, Jian |
| author_facet | Chen, Xingzhou Guan, Yuanjun Ghazaryan, Areg Sun, Shiran Yu, Lingxiao Lv, Ruitao Volosniev, Artem Sun, Zheng Wu, Jian |
| contents | The valley degree of freedom in atomically thin transition-metal dichalcogenides provides a natural binary index for information processing. Exciton-polaritons formed under strong light-matter coupling offer a promising route to overcome the limited lifetime and transport of bare valley excitons. Here we report an anomalous optical valley Hall effect in a monolayer WS2 exciton-polariton system. Using polarization- and time-resolved real-space imaging, we directly visualize a symmetry-breaking spatial separation of polaritons from opposite valleys under linearly polarized excitation, accompanied by an ultrafast Hall drift velocity on the order of 10^5 m/s. This behaviour cannot be accounted for by conventional cavity-induced mechanisms and instead points to a strain-induced synthetic pseudomagnetic field acting on the excitonic component of polaritons. Our results establish exciton-polaritons as a high-speed and optically accessible platform for valley transport, opening pathways towards tunable valleytronic and topological photonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15631 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anomalous valley Hall dynamics of exciton-polaritons Chen, Xingzhou Guan, Yuanjun Ghazaryan, Areg Sun, Shiran Yu, Lingxiao Lv, Ruitao Volosniev, Artem Sun, Zheng Wu, Jian Mesoscale and Nanoscale Physics Optics The valley degree of freedom in atomically thin transition-metal dichalcogenides provides a natural binary index for information processing. Exciton-polaritons formed under strong light-matter coupling offer a promising route to overcome the limited lifetime and transport of bare valley excitons. Here we report an anomalous optical valley Hall effect in a monolayer WS2 exciton-polariton system. Using polarization- and time-resolved real-space imaging, we directly visualize a symmetry-breaking spatial separation of polaritons from opposite valleys under linearly polarized excitation, accompanied by an ultrafast Hall drift velocity on the order of 10^5 m/s. This behaviour cannot be accounted for by conventional cavity-induced mechanisms and instead points to a strain-induced synthetic pseudomagnetic field acting on the excitonic component of polaritons. Our results establish exciton-polaritons as a high-speed and optically accessible platform for valley transport, opening pathways towards tunable valleytronic and topological photonic devices. |
| title | Anomalous valley Hall dynamics of exciton-polaritons |
| topic | Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2601.15631 |