Programming correlated magnetic states with gate-controlled moiré geometry.
basic_science · Level V
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- Record sourced from PubMed, PMID 37347950.
- Also identified by DOI 10.1126/science.adg4268.
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Abstract
The ability to control the underlying lattice geometry of a system may enable transitions between emergent quantum ground states. We report in situ gate switching between honeycomb and triangular lattice geometries of an electron many-body Hamiltonian in rhombohedral (R)-stacked molybdenum ditelluride (MoTe<sub>2</sub>) moiré bilayers, resulting in switchable magnetic exchange interactions. At zero electric field, we observed a correlated ferromagnetic insulator near one hole per moiré unit cell with a widely tunable Curie temperature up to 14 K. Applying an electric field switched the system into a half-filled triangular lattice with antiferromagnetic interactions; further doping this layer-polarized superlattice tuned the antiferromagnetic exchange interaction back to ferromagnetic. Our work demonstrates R-stacked MoTe<sub>2</sub> moirés to be a laboratory for engineering correlated states with nontrivial topology.