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Diverse magnetic orders and quantum anomalous Hall effect in twisted bilayer MoTe2 and WSe2
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Diverse magnetic orders and quantum anomalous Hall effect in twisted bilayer MoTe2 and WSe2
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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.
Forward citations
Cited by 6 Pith papers
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Retarded interaction between opposite chiral edges in anomalous Hall crystals
Transverse bulk phonons in anomalous Hall crystals mediate a retarded interaction between opposite chiral edges, detectable as a delayed nonlocal response.
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Hybridization between magneto-roton and moiré interband excitations in twisted MoTe2 creates an optically active exciton-roton mode with a characteristic roton minimum that is absent in continuum fractional quantum Ha...
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Multi-Q spin-valley order in twisted WSe2
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.
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Wilson-Loop-Ideal Bands and General Idealization
Introduces Wilson-loop-ideal bands saturating the quantum metric Wilson-loop bound and a general monotonic flow construction applied to moiré models to achieve low-error ideal states for correlated physics.
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Non-Abelian Chern band in rhombohedral graphene multilayers
Hartree-Fock calculations show a doubly degenerate non-Abelian Chern band with |C|=1 at ν=2 in rhombohedral multilayer graphene, characterized by SU(2) gauge flux and non-Abelian holonomy.
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Van Hove Singularity-Driven Topological Magnetism in Twisted MoTe2
Tuning twisted bilayer MoTe2 to a van Hove singularity near nu = -1 produces a correlated intervalley-coherent antiferromagnetic state with anomalous Hall response that evolves into a C = -1 Chern insulator under magn...
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