Revealing intrinsic domains and fluctuations of moiré magnetism by a wide-field quantum microscope

Mengqi Huang, Zeliang Sun, Gerald Yan, Hongchao Xie, Nishkarsh Agarwal, Gaihua Ye, Suk Hyun Sung, Hanyi Lu, Jingcheng Zhou, Shaohua Yan, Shangjie Tian, Hechang Lei, Robert Hovden, Rui He, Hailong Wang, Liuyan Zhao () and Chunhui Rita Du ()
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Mengqi Huang: University of California, San Diego
Zeliang Sun: University of Michigan
Gerald Yan: University of California, San Diego
Hongchao Xie: University of Michigan
Nishkarsh Agarwal: University of Michigan
Gaihua Ye: Texas Tech University
Suk Hyun Sung: University of Michigan
Hanyi Lu: University of California, San Diego
Jingcheng Zhou: University of California, San Diego
Shaohua Yan: Renmin University of China
Shangjie Tian: Renmin University of China
Hechang Lei: Renmin University of China
Robert Hovden: University of Michigan
Rui He: Texas Tech University
Hailong Wang: Georgia Institute of Technology
Liuyan Zhao: University of Michigan
Chunhui Rita Du: University of California, San Diego

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Moiré magnetism featured by stacking engineered atomic registry and lattice interactions has recently emerged as an appealing quantum state of matter at the forefront of condensed matter physics research. Nanoscale imaging of moiré magnets is highly desirable and serves as a prerequisite to investigate a broad range of intriguing physics underlying the interplay between topology, electronic correlations, and unconventional nanomagnetism. Here we report spin defect-based wide-field imaging of magnetic domains and spin fluctuations in twisted double trilayer (tDT) chromium triiodide CrI3. We explicitly show that intrinsic moiré domains of opposite magnetizations appear over arrays of moiré supercells in low-twist-angle tDT CrI3. In contrast, spin fluctuations measured in tDT CrI3 manifest little spatial variations on the same mesoscopic length scale due to the dominant driving force of intralayer exchange interaction. Our results enrich the current understanding of exotic magnetic phases sustained by moiré magnetism and highlight the opportunities provided by quantum spin sensors in probing microscopic spin related phenomena on two-dimensional flatland.

Date: 2023
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DOI: 10.1038/s41467-023-40543-z

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