![[NCTS Physics Research Highlights] Yang-hao Chan 'Intralayer charge-transfer moire excitons in van der Waals superlattice', Nature 609, 52 (2022)](/uploads/asset/data/63737ce91d41c8c5a7f625c0/_NCTS_Physics_Research_Highlights__Yang-hao_Chan__Intralayer_charge-transfer_moire_excitons_in_van_der_Waals_superlattice___Nature_609__52__2022_.png "[NCTS Physics Research Highlights] Yang-hao Chan 'Intralayer charge-transfer moire excitons in van der Waals superlattice', Nature 609, 52 (2022)")
凡得瓦超晶格中的層間電荷轉移摩爾激子
Intralayer charge-transfer moire excitons in van der Waals superlattice
Mit H. Naik, Emma C. Regan, Zuocheng Zhang, Yang-Hao Chan*, Zhenglu Li, Danqing Wang, Yoseob Yoon, Chin Shen Ong, Wenyu Zhao, Sihan Zhao, M. Iqbal Bakti Utama, Beini Gao, Xin Wei, Mohammed Sayyad, Kentaro Yumigeta, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Felipe H. da Jornada, Feng Wang & Steven G. Louie
Nature 609, 52 (2022)
DOI: https://doi.org/10.1038/s41586-022-04991-9
近年來在異質雙層二維材料中發現由層間堆疊夾角引起的摩爾紋可以產生各種電子關聯相態。其中，摩爾激子雖然在近年已可從光學實驗觀測到，我們對其具體的微觀結構仍然缺乏了解。在這篇工作中與柏克萊的理論及實驗團隊合作，利用大規模的GW-BSE計算，我們發現新的電荷轉移激子。實驗中觀察到不同激子的吸收光譜對於電荷摻雜及磁場變化的獨特的相依性更進一步驗證理論計算的發現。
Moire patterns in hetrobilayer two dimensional materials have proven to be an excellent platform to host various correlated electronic phases. Although moire excitons were discovered from optical measurements, their microscopic structure is not fully understood. Here, working with the theoretical and experimental teams in UC Berkeley, we find new intralyer charge transfer excitons in moire superlattice by large scale GW-BSE calculations. The nature of different excitons is further confirmed by their unique dependence of optical resonance on charge doping and magnetic field.
