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説明:

Moiré heterostructures consisting of transition metal dichalcogenide (TMD) hetero- and homo bilayers have emerged as a promising material platform to study correlated electronic states. Optical signatures of strong correlations in the form of Mott–Wigner states and fractional Chern insulators have already been observed in TMD monolayers and their twisted bilayers. In this work, we use a moiré substrate containing a twisted hexagonal boron nitride (h-BN) interface to externally generate a superlattice potential for the TMD layer: the periodic structure of ferroelectric domains in h-BN effects a purely electrostatic potential for charge carriers. We find direct evidence for the induced moiré potential in the emergence of new excitonic resonances at integer fillings, and our observation of an enhancement of the trion binding energy by ≃ 3 meV. A theoretical model for exciton-electron interactions allows us to directly determine the moiré potential modulation of 30 ± 5 meV from the measured trion binding energy shift. We obtain direct evidence for charge order linked to electronic Mott–Wigner states at filling factors ν = 1/3 and ν = 2/3 through the associated exciton Umklapp resonances.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: moiré potential
, trion, Mott-Wigner states


刊行年月日: 2025-03-05

出版者: American Physical Society (APS)

掲載誌:

• Physical Review X (ISSN: 21603308) vol. 15 issue. 1 011049

研究助成金:

• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 200021-204076
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• World Premier International Research Center Initiative

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevx.15.011049

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更新時刻: 2026-02-16 16:31:06 +0900

MDRでの公開時刻: 2026-02-16 13:57:31 +0900