Coherent Modulation of Two-Dimensional Moiré States with On-Chip THz Waves
van der Waals (vdW) structures host a broad range of physical phenomena. New opportunities arise if different functional layers are remotely modulated or coupled in a device structure. Here we demonstrate the in situ coherent modulation of moiré excitons and correlated Mott insulators in transition metal dichalcogenide (TMD) moirés with on-chip terahertz (THz) waves. Using common dual-gated device structures of a TMD moiré bilayer sandwiched between two few-layer graphene (fl-Gr) gates with hexagonal boron nitride (h-BN) spacers, we launch coherent phonon wavepackets at ∼0.4-1 THz from the fl-Gr gates by femtosecond laser excitation. The waves travel through the h-BN spacer, arrive at the TMD bilayer with precise timing, and coherently modulate the moiré excitons or Mott states. These results demonstrate that the fl-Gr gates, often used for electrical control, can serve as on-chip opto-elastic transducers to generate THz waves for coherent control and vibrational entanglement of functional layers in moiré devices.
Authors
- Xiaodong Xu (ORCID: https://orcid.org/0000-0003-0348-2095)
- James Hone (ORCID: https://orcid.org/0000-0002-8084-3301)
- Daniel R. Gamelin (ORCID: https://orcid.org/0000-0003-2888-9916)
- Sebastian F. Maehrlein (ORCID: https://orcid.org/0000-0002-9472-5701)
- Yiliu Li (ORCID: https://orcid.org/0000-0003-3959-2675)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Cory R. Dean (ORCID: https://orcid.org/0000-0003-2967-5960)
- Eric A. Arsenault (ORCID: https://orcid.org/0000-0002-5363-3229)
- Birui Yang (ORCID: https://orcid.org/0009-0000-2346-8173)
- Heonjoon Park (ORCID: https://orcid.org/0000-0002-3895-9589)
- Xiaoyang Zhu (ORCID: https://orcid.org/0000-0002-2090-8484)
- Xi Wang (ORCID: https://orcid.org/0000-0002-0641-0882)
- Yinjie Guo
Institutions
- University of Washington (US)
- Washington University in St. Louis (US)
- National Institute for Materials Science (JP)
- Fritz Haber Institute of the Max Planck Society (DE)
- Columbia University (US)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-09-20
- DOI
- https://doi.org/10.1021/acs.nanolett.4c03129
- Citations
- 8
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 2.70
Funders
- Simons Foundation
- Japan Society for the Promotion of Science
- Basic Energy Sciences