Electronic commensuration of a spin moiré superlattice in a layered magnetic semimetal
Spin moiré superlattices (SMSs) have been proposed as a magnetic analog of crystallographic moiré systems and a source of electron minibands offering vector-field moiré tunability and Berry curvature effects. However, it has proven challenging to realize an SMS in which a large exchange coupling <i>J</i> is transmitted between conduction electrons and localized spins. Furthermore, most systems have carrier mean free paths <i>l</i><sub>mfp</sub> shorter than their spin moiré lattice constant <i>a</i><sub>spin</sub>, inhibiting miniband formation. Here, we discover that the layered magnetic semimetal EuAg<sub>4</sub>Sb<sub>2</sub> overcomes these challenges by forming an interface with <i>J</i> ~ 100 milli-electron volts transferred between a Eu triangular lattice and anionic Ag<sub>2</sub>Sb bilayers hosting a two-dimensional electron band in the ballistic regime (<i>l</i><sub>mfp</sub> >> <i>a</i><sub>spin</sub>). The system realizes an SMS with <i>a</i><sub>spin</sub> commensurate with the Fermi momentum, leading to a marked quenching of the transport response from miniband formation. Our findings demonstrate an approach to magnetically engineering moiré superlattices and a potential route to an emergent spin-driven quantum Hall state.
Authors
- Efthimios Kaxiras (ORCID: https://orcid.org/0000-0002-4682-0165)
- Eli Rotenberg (ORCID: https://orcid.org/0000-0002-3979-8844)
- T. Suzuki (ORCID: https://orcid.org/0000-0002-5670-2103)
- Linda Ye (ORCID: https://orcid.org/0000-0001-7949-1356)
- Mingu Kang (ORCID: https://orcid.org/0000-0001-6991-0481)
- Chris M. Jozwiak (ORCID: https://orcid.org/0000-0002-0980-3753)
- M. K. Chan (ORCID: https://orcid.org/0000-0002-8808-9040)
- Jonathan D. Denlinger (ORCID: https://orcid.org/0000-0001-7645-1631)
- Joseph George Checkelsky (ORCID: https://orcid.org/0000-0003-0325-5204)
- Aaron Bostwick (ORCID: https://orcid.org/0000-0002-9008-2980)
- Takashi Kurumaji (ORCID: https://orcid.org/0000-0002-2157-3727)
- Riccardo Comin (ORCID: https://orcid.org/0000-0002-1069-9973)
- Paul M. Neves (ORCID: https://orcid.org/0000-0003-4637-5855)
- Taro Nakajima (ORCID: https://orcid.org/0000-0001-6557-5508)
- J. W. Lynn
- Nisarga Paul (ORCID: https://orcid.org/0000-0001-9044-3531)
- David E Graf (ORCID: https://orcid.org/0000-0001-6195-0462)
- J. S. White (ORCID: https://orcid.org/0000-0001-7738-0150)
- Shiang Fang (ORCID: https://orcid.org/0000-0002-9412-6426)
- Yang Zhao (ORCID: https://orcid.org/0000-0002-7331-791X)
- Liang Fu (ORCID: https://orcid.org/0000-0002-8803-1017)
Institutions
- Rutgers, The State University of New Jersey (US)
- National Institute of Standards and Technology (US)
- Harvard University (US)
- Lawrence Berkeley National Laboratory (US)
- Paul Scherrer Institute (CH)
- RIKEN Center for Emergent Matter Science (JP)
- National High Magnetic Field Laboratory (US)
- Korea Foundation for Max Planck POSTECH (KR)
- NIST Center for Neutron Research (US)
- Massachusetts Institute of Technology (US)
- University of Maryland, College Park (US)
- The University of Tokyo (JP)
Publication Details
- Journal
- Science Advances
- Published
- 2025-02-05
- DOI
- https://doi.org/10.1126/sciadv.adu6686
- Citations
- 3
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 3.74
Funders
- National Science Foundation
- U.S. Department of Energy
- Gordon and Betty Moore Foundation
- National Research Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- National Research Foundation of Korea
- Paul Scherrer Institut
- National Institute of Standards and Technology
- Samsung
- Office of Science
- Japan Society for the Promotion of Science
- Office of Naval Research
- Basic Energy Sciences
- Air Force Office of Scientific Research
- Los Alamos National Laboratory