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- Title
Atomic-scale visualization of the interlayer Rydberg exciton complex in moiré heterostructures.
- Authors
Zhao, Meng; Wang, Zhongjie; Liu, Lu; Wang, Chunzheng; Liu, Cheng-Yen; Yang, Fang; Wu, Hua; Gao, Chunlei
- Abstract
Excitonic systems, facilitated by optical pumping, electrostatic gating or magnetic field, sustain composite particles with fascinating physics. Although various intriguing excitonic phases have been revealed via global measurements, the atomic-scale accessibility towards excitons has yet to be established. Here, we realize the ground-state interlayer exciton complexes through the intrinsic charge transfer in monolayer YbCl3/graphite heterostructure. Combining scanning tunneling microscope and theoretical calculations, the excitonic in-gap states are directly profiled. The out-of-plane excitonic charge clouds exhibit oscillating Rydberg nodal structure, while their in-plane arrangements are determined by moiré periodicity. Exploiting the tunneling probe to reflect the shape of charge clouds, we reveal the principal quantum number hierarchy of Rydberg series, which points to an excitonic energy-level configuration with unusually large binding energy. Our results demonstrate the feasibility of mapping out the charge clouds of excitons microscopically and pave a brand-new way to directly investigate the nanoscale order of exotic correlated phases. Recently, Rydberg excitons have been demonstrated in transition metal dichalcogenide moire superlattices. Here, using atomic-scale imaging, the authors observe Rydberg structure and moire periodicity of ground-state interlayer excitons in a monolayer YbCl3 on highly oriented pyrolytic graphite.
- Subjects
PYROLYTIC graphite; SCANNING tunneling microscopy; PARTICLE physics; RYDBERG states; HETEROSTRUCTURES; QUANTUM numbers; OPTICAL pumping
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-47770-y