Imaging orbital ferromagnetism in a moiré Chern insulator
Abstract
Ferromagnetism is associated with the breaking of time-reversal symmetry, most frequently by the spin degree of freedom. Although the orbital motion of electrons can also contribute to ferromagnetism, in most materials, it is small relative to the spin contribution. Tschirhart et al. showed that the reverse is true in an unusual magnetic state hosted by twisted bilayer graphene. Their scanning magnetometry measurements were consistent with ferromagnetism of predominantly orbital origin.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 18, 2021
- Source ID
- 10.1126/science.abd3190
Entities
People
- A. Shragai
- Andrea Young
- Charles Tschirhart
- Hryhoriy Polshyn
- Junqin Zhu
- Kenji Watanabe
- M. Serlin
- Martin E. Huber
- Takashi Taniguchi
- Yuxuan Zhang
- Zhengchao Xia
Organizations
- Army Research Office
- Gordon and Betty Moore Foundation
- Hertz Foundation
- Japan Society for the Promotion of Science
- National Institute for Materials Science
- National Science Foundation
- United States Department of Energy
- University of California
- University of Colorado Denver