(Oct. 29, 2026) Emergent Moiré Magnetism in Twisted 2D Magnets
Speaker:
Prof. Tiancheng Song,
Assistant Professor of Physics
University of Wisconsin-Madison
Time:
October 29, 11am-12pm (Central Time)
Virtual Link:
https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.us%2Fv3%2F__https%3A%2F%2Fgcc02.safelinks.protection.outlook.com%2Fap%2Ft-59584e83%2F%3Furl%3Dhttps*3A*2F*2Fteams.microsoft.com*2Fmeet*2F221252237523772*3Fp*3DO64gP5Z3DBAOpmvsuE%26data%3D05*7C02*7Cmsd*40anl.gov*7Caeec8bbb5ace474d49aa08df3133b751*7C0cfca18525f749e38ae7704d5326e285*7C0*7C0*7C639283770312138895*7CUnknown*7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ*3D*3D*7C0*7C*7C*7C%26sdata%3DeaI2I9w4C6ZrRDsmP*2B2KB*2F2Fbb0hWJ*2BygZ4ooSmp580*3D%26reserved%3D0__%3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl!!G_uCfscf7eWS!fro4gSz2V7_m6OZxc7wHGw7hSes45ITtXEOJ5ZErs2D55c-wsoN-UC86dSLM3rRjwFGqqVu20h1W%24&data=05%7C02%7Cyili%40anl.gov%7C79e78baa9e1f49cfc55908df3133c0f8%7C0cfca18525f749e38ae7704d5326e285%7C0%7C0%7C639283770526311082%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BXPfgNKLaUzMzTLlyGHF856LZb7CbqSDmjeKN6V%2FT74%3D&reserved=0
Abstract:
Recent advances in moiré superlattices and twistronics have opened new avenues for discovering emergent quantum phenomena. Numerous breakthroughs have been made in exploring new topological and strongly correlated phases, as well as the emergence of novel magnetic orders in twisted 2D materials. In particular, twisted 2D magnets provide a promising platform for exploring novel spin textures through moiré engineering, where twisting van der Waals magnets introduces spatially modulated interlayer magnetic interactions. Among various 2D magnets, chromium triiodide (CrI3) exhibits unique stacking-dependent interlayer magnetism, where monoclinic stacking favors antiferromagnetic coupling, while rhombohedral stacking gives rise to ferromagnetic coupling. This opens up new opportunities to control and engineer competing antiferromagnetic and ferromagnetic exchange interactions at the nanoscale, resulting in noncollinear states and even topologically nontrivial spin textures. By combining magneto-optical measurements, scanning NV magnetometry, and 2D exciton sensing, we reveal the coexistence of antiferromagnetic and ferromagnetic coupling, moiré-induced magnetic domains, and moiré skyrmionic phases. These highlight magnetic moiré superlattices as an exciting platform to investigate the emergent moiré magnetic phases.
BIO:
Tiancheng Song has been an Assistant Professor of Physics at the University of Wisconsin-Madison since May 2024. He received his Ph.D. in Physics from the University of Washington with Prof. Xiaodong Xu in 2021, and then he was a Dicke Fellow at Princeton University working with Prof. Sanfeng Wu from 2021 to 2024. His research focuses on studying 2D magnetism, 2D superconductivity, and topology by using various techniques, such as nanodevice abrication, magneto-optics, quantum transport, thermoelectrics, optoelectronics, optical spectroscopy and microscopy. He received DOE Early Career Research Program Award, Lee Osheroff Richardson Science Prize, and Guo Moruo Presidential Scholarship
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- 9700 S Cass Ave
- LEMONT, Illinois
- United States 60439
- Starts 28 October 2026 10:52 PM UTC
- Ends 29 October 2026 05:00 AM UTC
- No Admission Charge