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説明:

Two-dimensional (2D) materials serve as exceptional platforms for
controlled second-harmonic generation (SHG). Current approaches to SHG control
often depend on nonresonant conditions or symmetry breaking via single-gate control.
Here, we employ dual-gate bilayer WSe2 to demonstrate an SHG enhancement
concept that leverages strong exciton resonance and a layer-dependent exciton-polaron
effect. By selectively localizing injected holes within one layer, we induce exciton-
polaron states in the hole-filled layer while maintaining normal exciton states in the
charge-neutral layer. The distinct resonant conditions of these layers effectively break
interlayer inversion symmetry, thereby promoting resonant SHG. This method
achieves a remarkable 40-fold enhancement of SHG at minimal electric field, equivalent to conditions near the dielectric-breakdown threshold but using only ∼3% of the critical breakdown field. Our results highlight SHG sensitivity to carrier density and type, offering a new tool for manipulating SHG and probing quantum states in 2D excitonic systems.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: second-harmonic generation (SHG)
, WSe2
, exciton-polaron


刊行年月日: 2024-11-20

出版者: American Chemical Society (ACS)

掲載誌:

• Nano Letters (ISSN: 15306984) vol. 24 issue. 46 p. 14847-14853

研究助成金:

• U.S. Department of Defense W911NF2110260
• U.S. Department of Defense FA9550-20-1-0097
• Ministry of Education, Culture, Sports, Science and Technology 19H05790
• Ministry of Education, Culture, Sports, Science and Technology 20H00354
• Ministry of Education, Culture, Sports, Science and Technology 21H05233
• American Chemical Society 61640-ND6
• National Science Foundation 1945660
• ARO MURI W911NK-24-1-0292

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.nanolett.4c04544

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更新時刻: 2026-02-10 12:30:14 +0900

MDRでの公開時刻: 2026-02-10 09:14:31 +0900