SPICE Workshop on Quantum materials and quantum information science May 19th - 21st, 2026
Chunhui Du
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 magnetism. In this talk, I will present our recent work on using nitrogen-vacancy (NV) centers to perform nanoscale quantum sensing and imaging of magnetic domains and spin fluctuations in twisted double trilayer (tDT) chromium triiodide CrI3. We show that intrinsic moiré domains of opposite magnetizations appear over arrays of moiré supercells in low-twist-angle tDT CrI3 [1]. In addition, spin fluctuations measured in tDT CrI3 reveal two distinct magnetic phase transitions with separate critical temperatures within a moiré supercell [2]. 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. Lastly, I will extend my discussion to briefly present our ongoing efforts on exploring next-generation van der Waals quantum sensing technologies using color centers beyond NVs [3, 4, 5].
References:
- Huang et al., Nat. Commun. 14, 5259 (2023).
- Li et al., Nat. Commun. 15, 5712 (2024).
- Huang et al., Nat. Commun. 13, 5369 (2022).
- Zhou et al., Sci. Adv. 10, eadk8495 (2024).
- Zhang et al., arXiv:2502.04561 (2025).