Strain Correlated Linearly Polarized Photoluminescence in WS2/WSe2 Moiré Superlattices
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910182535069696 |
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| author | Urano, Yuto Tamura, Ryo Tamogami, Yui Kariyado, Toshikaze Miyata, Yasumitsu Kozawa, Daichi Watanabe, Kenji Taniguchi, Takashi Kitaura, Ryo |
| author_facet | Urano, Yuto Tamura, Ryo Tamogami, Yui Kariyado, Toshikaze Miyata, Yasumitsu Kozawa, Daichi Watanabe, Kenji Taniguchi, Takashi Kitaura, Ryo |
| contents | Reliable optical control of valley degrees of freedom in moiré excitons requires that the emitted polarization faithfully reflect the underlying valley state. Here, we show that linearly polarized photoluminescence from WSe2/WS2 moiré excitons is largely insensitive to the excitation polarization and therefore does not arise from valley coherence. Automated polarization-resolved photoluminescence and Raman mapping at cryogenic temperature reveals that the degree of linear polarization correlates strongly with local Raman shifts and moiré-exciton observables, identifying strain as the dominant experimental correlate. Linear-regression analysis further shows that strain-related descriptors provide the best prediction of the observed polarization. Guided by theory, we attribute this behavior to strain-amplified breaking of C3 symmetry in the moiré potential: weak uniaxial strain produces only partial cancellation of locally elliptical emission, yielding a finite far-field degree of linear polarization. These results establish strain as a key control parameter for reliable optical readout in TMD moiré superlattices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_16934 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Strain Correlated Linearly Polarized Photoluminescence in WS2/WSe2 Moiré Superlattices Urano, Yuto Tamura, Ryo Tamogami, Yui Kariyado, Toshikaze Miyata, Yasumitsu Kozawa, Daichi Watanabe, Kenji Taniguchi, Takashi Kitaura, Ryo Materials Science Mesoscale and Nanoscale Physics Reliable optical control of valley degrees of freedom in moiré excitons requires that the emitted polarization faithfully reflect the underlying valley state. Here, we show that linearly polarized photoluminescence from WSe2/WS2 moiré excitons is largely insensitive to the excitation polarization and therefore does not arise from valley coherence. Automated polarization-resolved photoluminescence and Raman mapping at cryogenic temperature reveals that the degree of linear polarization correlates strongly with local Raman shifts and moiré-exciton observables, identifying strain as the dominant experimental correlate. Linear-regression analysis further shows that strain-related descriptors provide the best prediction of the observed polarization. Guided by theory, we attribute this behavior to strain-amplified breaking of C3 symmetry in the moiré potential: weak uniaxial strain produces only partial cancellation of locally elliptical emission, yielding a finite far-field degree of linear polarization. These results establish strain as a key control parameter for reliable optical readout in TMD moiré superlattices. |
| title | Strain Correlated Linearly Polarized Photoluminescence in WS2/WSe2 Moiré Superlattices |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.16934 |