Emergent Trion Resonance Driven by Lattice Reconstruction in a Moiré Superlattice.

Authors

Zhida Liu, Haonan Wang, Xiaohui Liu, Yue Ni, Hongtao Yan, Frank Y Gao, Saba Arash, Hyunsue Kim, Dong Seob Kim, Xiangcheng Liu, Xiaoxiao Yu, Yongxin Zeng, Jiamin Quan, Di Huang, Kenji Watanabe, Takashi Taniguchi, Edoardo Baldini, Keji Lai, Allan H MacDonald, Chih-Kang Shih, Jamie Warner, Li Yang, Xiaoqin Li

Published in

Physical review letters. Volume 137. Issue 3. Pages 036902. Jul 17, 2026.

Abstract

We investigate how many-electron excited states emerge in twisted MoSe_{2} homobilayers when the lattice reconstructions evolve. Notably, we identify a new trion resonance that arises in the transition regime of lattice reconstruction, where gradual changes in atomic alignment between the layers occur. Magnetic field-dependent measurements, supported by first-principles calculations, indicate that the exciton forms at the K valley while the doped hole resides in the Γ valley. First-principles calculations further indicate that two nearly degenerate exciton resonances can arise, localized at different sites within the moiré supercell. We propose that the new trion resonance is a "charge-transfer" trion, in which the electron-hole pair is spatially separated from the doped hole. The emergence of these complex excited states stems from the distinct moiré potentials acting on holes and excitons, resulting in their different spatial distribution within the superlattice.

PMID:
42537098
Bibliographic data and abstract were imported from PubMed on 01 Aug 2026.

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