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Peer-reviewedCC BYNano letters

Strain Correlated Linearly Polarized Photoluminescence in WSe2/WS2 Moiré Superlattices.

  • Yuto Urano1,2
  • Ryo Tamura3,4
  • Yui Tamogami1,5
  • Toshikaze Kariyado1
  • Yasumitsu Miyata1
  • Daichi Kozawa1
  • Kenji Watanabe6
  • Takashi Taniguchi1
  • Ryo Kitaura1,2
6 affiliations
  1. 1Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki305-0044, Japan.
  2. 2Graduate School of Chemical Sciences and Engineering, Hokkaido University, 5, Kita 8 Nishi, Kita-ku, Sapporo, Hokkaido060-8628, Japan.
  3. 3Center for Basic Research on Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki305-0044, Japan.
  4. 4Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba277-8568, Japan.
  5. 5Department of Physics, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo192-0397, Japan.
  6. 6Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki305-0044, Japan.
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Abstract

Reliable optical control of valley degrees of freedom in moiré excitons requires that the emitted polarization faithfully reflects the underlying valley state. Here, we show that linearly polarized photoluminescence from WSe2/WS2 moiré excitons is largely insensitive to the excitation linear polarization and therefore does not arise from valley coherence. Automated polarization-resolved photoluminescence and Raman mapping at cryogenic temperature reveal 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.

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Cite

BibTeXRIS
BibTeX
@article{urano2026strain,
  title = {{Strain Correlated Linearly Polarized Photoluminescence in WSe2/WS2 Moiré Superlattices.}},
  author = {Yuto Urano and Ryo Tamura and Yui Tamogami and Toshikaze Kariyado and Yasumitsu Miyata and Daichi Kozawa and Kenji Watanabe and Takashi Taniguchi and Ryo Kitaura},
  journal = {Nano letters},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.nanolett.6c02363},
  url = {https://europepmc.org/article/MED/42917384},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Strain Correlated Linearly Polarized Photoluminescence in WSe2/WS2 Moiré Superlattices.
AU  - Yuto Urano
AU  - Ryo Tamura
AU  - Yui Tamogami
AU  - Toshikaze Kariyado
AU  - Yasumitsu Miyata
AU  - Daichi Kozawa
AU  - Kenji Watanabe
AU  - Takashi Taniguchi
AU  - Ryo Kitaura
PY  - 2026
DA  - 2026/10/01
JO  - Nano letters
DO  - 10.1021/acs.nanolett.6c02363
UR  - https://europepmc.org/article/MED/42917384
AB  - Reliable optical control of valley degrees of freedom in moiré excitons requires that the emitted polarization faithfully reflects the underlying valley state. Here, we show that linearly polarized photoluminescence from WSe2/WS2 moiré excitons is largely insensitive to the excitation linear polarization and therefore does not arise from valley coherence. Automated polarization-resolved photoluminescence and Raman mapping at cryogenic temperature reveal 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.
SN  - 1530-6984
SN  - 1530-6992
ER  -