Moiré excitons in generalized Wigner crystals
學年 114
學期 2
出版（發表）日期 2026-02-19
作品名稱 Moiré excitons in generalized Wigner crystals
作品名稱（其他語言）
著者 Jing-Yang You, Chih-En Hsu, Zien Zhu, Benran Zhang, Ziliang Ye, Mit H. Naik, Ting Cao, Hung-Chung Hsueh(薛宏中), Steven G. Louie, Mauro Del Benj, and Zhenglu L
單位
出版者
著錄名稱、卷期、頁數 Proceedings of the National Academy of Sciences (PNAS) , vol.123, no.14, e2531259123
摘要 Moiré superlattices of transition-metal dichalcogenide bilayers host strong Coulomb interactions residing in narrow electron bands, leading to correlated insulating states at fractional carrier doping densities, known as generalized Wigner crystals. In excited states, the formation of moiré excitons can be fundamentally shaped by the Wigner-crystal ground states, manifesting an intricate interplay between electronic and excitonic correlations. However, the microscopic description of these Wigner crystalline excitons (WCEs) remains elusive, largely subject to speculations, and is further needed for the understanding of exotic excitonic phases (e.g., exciton insulators and exciton density waves) and their unique properties (e.g., anomalous exciton diffusion). Here, using first-principles many-body GW–Bethe–Salpeter equation calculations, we directly reveal the internal structures of WCEs in angle-aligned MoSe2/MoS2 moiré heterostructure at hole fillings of 1/3 and 2/3. Our results uncover the propagation of correlation effects from the ground state to excited states, shaping the real-space characteristics of WCEs. The strong two-particle excitonic correlations dominate over the kinetic energy of free electron–hole pairs, in analog to the strong single-particle correlations of flat bands. We propose that such unusual excited-state correlation effects of WCEs can be experimentally probed by photocurrent tunneling microscopy (PTM). Our work provides a microscopic understanding of strongly correlated WCEs, suggesting them as a highly tunable mixed boson-fermion platform to study many-body interactions and phenomena.
關鍵字
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Steven G. Louie, Mauro Del Benj, and Zhenglu L
審稿制度 1
國別 USA
公開徵稿
出版型式 ,電子版,紙本
SDGS 優質教育