Insulating charge transfer ferromagnetism

Yixin Zhang; Yang Zhang

doi:10.1103/wm3t-qyvx

Letter

Insulating charge transfer ferromagnetism

Yixin Zhang ^1,2 and Yang Zhang ^3,4

¹Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
²School of Physics, Peking University, Beijing 100871, China
³Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁴Min H. Kao Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996, USA

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Phys. Rev. B 112, L220408 – Published 12 December, 2025

DOI: https://doi.org/10.1103/wm3t-qyvx

Abstract

We propose a mechanism for insulating ferromagnetism in the honeycomb Hubbard model of semiconductor moiré superlattices. The ferromagnetism emerges at a critical charge transfer regime, stabilizing the quantum anomalous Hall state without Hund's coupling. We further note the ferromagnetic exchange applies to general charge transfer systems when breaking particle-hole symmetry.

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