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Stoner instabilities and Ising excitonic states in twisted transition metal dichalcogenides

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arxiv 2405.17316 v1 pith:324NI33H submitted 2024-05-27 cond-mat.str-el cond-mat.mes-hall

Augusto Ghiotto , LingNan Wei , Larry Song , Jiawei Zang , Aya Batoul Tazi , Daniel Ostrom , Kenji Watanabe , Takashi Taniguchi
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James C. Hone Daniel A. Rhodes Andrew J. Millis Cory R. Dean Lei Wang Abhay N. Pasupathy
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classification cond-mat.str-elcond-mat.mes-hall
keywords insulatormetalphasescommensurabilitydrivenexcitonicisingmoir
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Moir\'e transition metal dichalcogenide (TMD) systems provide a tunable platform for studying electron-correlation driven quantum phases. Such phases have so far been found at rational fillings of the moir\'e superlattice, and it is believed that lattice commensurability plays a key role in their stability. In this work, we show via magnetotransport measurements on twisted WSe2 that new correlated electronic phases can exist away from commensurability. The first phase is an antiferromagnetic metal that is driven by proximity to the van Hove singularity. The second is a re-entrant magnetic field-driven insulator. This insulator is formed from a small and equal density of electrons and holes with opposite spin projections - an Ising excitonic insulator.

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  1. Onset of spin-valley order and Stoner boundaries in twisted WSe$_2$

    cond-mat.supr-con 2026-01 conditional novelty 6.0 of 10

    Spin-valley fluctuations near the van Hove singularity in 5° twisted WSe2 produce a Stoner-ordered region whose flanks favor pairing, explaining the reentrant superconducting dome.

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