تقرير
Time-Domain Signatures of Distinct Correlated Insulators in a Moir\'e Superlattice
| العنوان: | Time-Domain Signatures of Distinct Correlated Insulators in a Moir\'e Superlattice |
|---|---|
| المؤلفون: | Arsenault, Eric A., Li, Yiliu, Yang, Birui, Taniguchi, Takashi, Watanabe, Kenji, Hone, James C., Dean, Cory R., Xu, Xiaodong, Zhu, X. -Y. |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Among expanding discoveries of quantum phases in moir\'e superlattices, correlated insulators stand out as both the most stable and most commonly observed. Despite the central importance of these states in moir\'e physics, little is known about their underlying nature. Here, we use pump-probe spectroscopy to show distinct time-domain signatures of correlated insulators at fillings of one (v = -1) and two (v = -2) holes per moir\'e unit cell in the angle-aligned WSe2/WS2 system. Following photo-doping, we find that the disordering time of the v = -1 state is independent of excitation density (n_ex), as expected from the characteristic phonon response time associated with a polaronic state. In contrast, the disordering time of the v = -2 state scales with (n_ex)^-0.5, in agreement with plasmonic screening from free holons and doublons. These states display disparate reordering behavior dominated either by first order (v = -1) or second order (v = -2) recombination, suggesting the presence of Hubbard excitons and free carrier-like holons/doublons, respectively. Our work delineates the roles of electron-phonon (e-ph) versus electron-electron (e-e) interactions in correlated insulators on the moir\'e landscape and establishes non-equilibrium responses as mechanistic signatures for distinguishing and discovering quantum phases. Comment: 18 pages, 4 figures, +10 Supporting figures. arXiv admin note: text overlap with arXiv:2307.16563 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2406.15067 |
| رقم الأكسشن: | edsarx.2406.15067 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |