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arXiv · 2305.02150

Kinetic Magnetism in Triangular Moir\'e Materials

Livio Ciorciaro·Tomasz Smolenski·Ivan Morera·Natasha Kiper·Sarah Hiestand·Martin Kroner·Yang Zhang·Kenji Watanabe·Takashi Taniguchi·Eugene Demler·Atac Imamoglu
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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 have been discussed theoretically but an experimental demonstration in an extended system has been missing. Here, we investigate MoSe$_2$/WS$_2$ van der Waals heterostructures in the vicinity of Mott insulator states of electrons forming a frustrated triangular lattice and observe direct evidence for magnetic correlations originating from a kinetic mechanism. By directly measuring electronic magnetization through the strength of the polarization-selective attractive polaron resonance, we find that when the Mott state is electron doped the system exhibits ferromagnetic correlations in agreement with the Nagaoka mechanism.

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Livio Ciorciaro, Tomasz Smolenski, Ivan Morera, Natasha Kiper, Sarah Hiestand, Martin Kroner, Yang Zhang, Kenji Watanabe, Takashi Taniguchi, Eugene Demler, Atac Imamoglu. 2023-05-03. Kinetic Magnetism in Triangular Moir\'e Materials. https://doi.org/10.1038/s41586-023-06633-0

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