Kinetic magnetism in triangular moiré materials.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37968525.
- Also identified by DOI 10.1038/s41586-023-06633-0 and PMC identifier 10651480.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Magnetic properties of materials ranging from conventional ferromagnetic metals to strongly correlated materials such as cuprates originate from Coulomb exchange interactions. The existence of alternate mechanisms for magnetism that could naturally facilitate electrical control has been discussed theoretically<sup>1-7</sup>, but an experimental demonstration<sup>8</sup> in an extended system has been missing. Here we investigate MoSe<sub>2</sub>/WS<sub>2</sub> van der Waals heterostructures in the vicinity of Mott insulator states of electrons forming a frustrated triangular lattice and observe direct evidence of magnetic correlations originating from a kinetic mechanism. By directly measuring electronic magnetization through the strength of the polarization-selective attractive polaron resonance<sup>9,10</sup>, we find that when the Mott state is electron-doped, the system exhibits ferromagnetic correlations in agreement with the Nagaoka mechanism.