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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Moire superlattices, Valley degrees of freedom, spectroscopy, two-dimensional materials

刊行年月日: 2026-10-07

出版者: American Chemical Society (ACS)

掲載誌:

• Nano Letters (ISSN: 15306984) vol. 26 issue. 39 p. 13255-13262

研究助成金:

• Japan Science and Technology Agency JPMJCR23A4
• Japan Science and Technology Agency JPMJFR213X
• JSPS KAKENHI JP20H00354
• JSPS KAKENHI JP21H05232
• JSPS KAKENHI JP21H05233
• JSPS KAKENHI JP21H05234
• JSPS KAKENHI JP22H04957
• JSPS KAKENHI JP23H02052
• JSPS KAKENHI JP23H05469
• JSPS KAKENHI JP24H00044
• JSPS KAKENHI JP24H02218
• JSPS KAKENHI JP25H00835
• JSPS KAKENHI JP25K22210
• JSPS KAKENHI JP25K24588
• JSPS KAKENHI JP26K22704
• World Premier International Research Center Initiative (WPI), MEXT, Japan

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.8684

公開URL: https://doi.org/10.1021/acs.nanolett.6c02363

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更新時刻: 2026-10-29 09:05:16 +0900

MDRでの公開時刻: 2026-10-29 10:32:24 +0900