Dynamics of a jointly commensurate moiré charge density wave.
14 affiliations
- 1Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts, USA.
- 2Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts, USA. [email protected].
- 3Tsung-Dao Lee Institute, School of Physics and Astronomy, and Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai, China.
- 4Department of Applied Physics, Stanford University, Stanford, California, USA.
- 5SIMES, SLAC National Accelerator Laboratory, Menlo Park, California, USA.
- 6Beijing Academy of Quantum Information Sciences, Beijing, China.
- 7International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
- 8Pohang Accelerator Laboratory, Pohang, Gyeongbuk, Republic of Korea.
- 9Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea.
- 10CHESS, Cornell University, Ithaca, New York, USA.
- 11SLAC National Accelerator Laboratory, Menlo Park, California, USA.
- 12Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Cambridge, Massachusetts, USA.
- 13Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
- 14Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts, USA. [email protected].
Abstract
The advent of two-dimensional moiré systems has revolutionized the exploration of phenomena arising from strong correlations and nontrivial band topology. Recently, a moiré superstructure formed by two coexisting charge density waves with slightly mismatched wavevectors has been realized. These incommensurate charge density waves can collectively exhibit commensurability, forming a jointly commensurate charge density wave that provides a paradigm for controlling moiré potential and periodicity. Here, we use time-resolved diffraction to probe the light-induced dynamics of the jointly commensurate charge density wave in EuTe₄. Our measurements distinguish the instantaneous quenching of its amplitude, as verified by time-resolved photoemission spectroscopy, from the slower evolution of phase fluctuations. Moreover, while the wavevector remains locked upon photoexcitation, the correlation length decreases exclusively perpendicular to the wavevector, revealing the formation of shear-type defects. Together, our multimodal approach reconstructs the temporal evolution of the jointly commensurate charge density wave, highlighting its robustness out of equilibrium and providing insights into the optical manipulation of moiré materials through defect control.
Related
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BibTeX
@article{oh2026dynamics,
title = {{Dynamics of a jointly commensurate moiré charge density wave.}},
author = {Kyoung Hun Oh and Yifan Su and Honglie Ning and B Q Lv and Alfred Zong and Dong Wu and Qiaomei Liu and Gyeongbo Kang and Hyeongi Choi and Hyun-Woo J Kim and Seunghyeok Ha and Jaehwon Kim and Suchismita Sarker and Jacob P C Ruff and Xiaozhe Shen and Duan Luo and Stephen Weathersby and Patrick Kramer and Xinxin Cheng and Dongsung Choi and Doron Azoury and Masataka Mogi and B J Kim and N L Wang and Hoyoung Jang and Nuh Gedik},
journal = {Nature communications},
year = {2026},
month = sep,
doi = {10.1038/s41467-026-77670-2},
url = {https://europepmc.org/article/MED/42894003},
note = {CC BY},
}
RIS
TY - JOUR
TI - Dynamics of a jointly commensurate moiré charge density wave.
AU - Kyoung Hun Oh
AU - Yifan Su
AU - Honglie Ning
AU - B Q Lv
AU - Alfred Zong
AU - Dong Wu
AU - Qiaomei Liu
AU - Gyeongbo Kang
AU - Hyeongi Choi
AU - Hyun-Woo J Kim
AU - Seunghyeok Ha
AU - Jaehwon Kim
AU - Suchismita Sarker
AU - Jacob P C Ruff
AU - Xiaozhe Shen
AU - Duan Luo
AU - Stephen Weathersby
AU - Patrick Kramer
AU - Xinxin Cheng
AU - Dongsung Choi
AU - Doron Azoury
AU - Masataka Mogi
AU - B J Kim
AU - N L Wang
AU - Hoyoung Jang
AU - Nuh Gedik
PY - 2026
DA - 2026/09/16
JO - Nature communications
DO - 10.1038/s41467-026-77670-2
UR - https://europepmc.org/article/MED/42894003
AB - The advent of two-dimensional moiré systems has revolutionized the exploration of phenomena arising from strong correlations and nontrivial band topology. Recently, a moiré superstructure formed by two coexisting charge density waves with slightly mismatched wavevectors has been realized. These incommensurate charge density waves can collectively exhibit commensurability, forming a jointly commensurate charge density wave that provides a paradigm for controlling moiré potential and periodicity. Here, we use time-resolved diffraction to probe the light-induced dynamics of the jointly commensurate charge density wave in EuTe₄. Our measurements distinguish the instantaneous quenching of its amplitude, as verified by time-resolved photoemission spectroscopy, from the slower evolution of phase fluctuations. Moreover, while the wavevector remains locked upon photoexcitation, the correlation length decreases exclusively perpendicular to the wavevector, revealing the formation of shear-type defects. Together, our multimodal approach reconstructs the temporal evolution of the jointly commensurate charge density wave, highlighting its robustness out of equilibrium and providing insights into the optical manipulation of moiré materials through defect control.
SN - 2041-1723
ER -