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Diverse magnetic orders and quantum anomalous Hall effect in twisted bilayer MoTe2 and WSe2

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arxiv 2306.02501 v3 pith:MMQZKDXE submitted 2023-06-04 cond-mat.str-el

Taige Wang , Trithep Devakul , Michael P. Zaletel , Liang Fu This is my paper · ORCID
classification cond-mat.str-el
keywords magnetictopologybandmagnonphasestwistedeffectinteraction-driven
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Twisted homobilayer transition metal dichalcogenide (TMD) offers a versatile platform for exploring band topology, interaction-driven phases, and magnetic orders. We study the interaction-driven phases in twisted TMD homobilayers and their low-energy collective excitations, focusing on the effect of band topology on magnetism and its thermal stability. From Hartree-Fock theory of the continuum model, we identify several magnetic and topological phases. By tuning the displacement field, we find two phase transitions involving a change in topology and magnetism respectively. We analyze the magnon spectrum, revealing the crucial role of band topology in stabilizing 2D ferromagnetism by amplifying easy-axis magnetic anisotropy, resulting in a large magnon gap of up to 7meV. As the magnon gap is directly tied to the stability of the magnetic phase to thermal fluctuations, our findings have several important experimental implications.

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Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A quantum geometric mechanism for chiral domain wall metastability: Application to twisted transition-metal dichalcogenides

    cond-mat.str-el 2026-08 conditional novelty 8.0 of 10

    Chiral domain walls in conjugate Chern bands bind a dipole density set by a geometric coefficient c_G, producing a metastable texture that explains long-lived excitations in twisted MoTe2.

  2. Observation of metastable chiral domain walls in a topological magnet

    cond-mat.mes-hall 2026-08 conditional novelty 8.0 of 10

    A metastable spin-valley excitation in the quantum anomalous Hall state of twisted MoTe2 is attributed to chiral domain walls stabilized by band quantum geometry.

  3. Retarded interaction between opposite chiral edges in anomalous Hall crystals

    cond-mat.mes-hall 2026-07 conditional novelty 7.0 of 10

    Transverse bulk phonons in anomalous Hall crystals mediate a retarded interaction between opposite chiral edges, detectable as a delayed nonlocal response.

  4. Multi-Q spin-valley order in twisted WSe2

    cond-mat.str-el 2025-10 conditional novelty 7.0 of 10

    At ν=1 in 3.65°-twisted WSe2, Hartree-Fock predicts that the 120° antiferromagnet gives way to coplanar or non-coplanar multi-Q magnetic order with four ordering wavevectors and soft M-point spin fluctuations.

  5. Magnetorotons in Moir\'e Fractional Chern Insulators

    cond-mat.str-el 2024-12 conditional novelty 6.0 of 10

    Moiré fractional Chern insulators in twisted MoTe2 are predicted to host universal finite-momentum magnetorotons, whose long-wavelength limit is a gapped chiral angular-momentum-2 geometric excitation.

  6. Magnetic Moir\'e Systems: a review

    cond-mat.mtrl-sci 2025-06 unverdicted

    This paper is a review, not a new result: it synthesizes published work on how moiré potentials alter magnetism in two-dimensional materials.

  7. Quantum Geometry in Quantum Materials

    cond-mat.mes-hall 2024-12 unverdicted

    This review surveys how the quantum geometric tensor shapes superconductivity, spin stiffness, exciton condensates, Landau levels, and fractional Chern insulators in quantum materials.

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