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<p>Competing electronic orders are a hallmark of strongly correlated materials. In twisted bilayer WSe<sub>2</sub>, experiments have recently revealed a transition between superconductivity and correlated magnetism at van Hove filling, controlled by the displacement field. Here, we provide a theoretical framework for such a transition in two-dimensional hexagonal systems with spin-orbit coupling and van Hove singularities (VHS) at the Fermi level. Using a minimal model, we show that the displacement field tunes the effective interactions and drives a Stoner-like transition. A renormalization group analysis predicts that chiral <i>d</i>/<i>p</i>-wave superconductivity dominates at weak fields (<i>D</i>&#xa0;&lt;&#xa0;<i>D</i><sub><i>c</i></sub>), while a valley ferromagnetic phase with spatially modulated magnetization at stronger fields (<i>D</i>&#xa0;&gt;&#xa0;<i>D</i><sub><i>c</i></sub>). We discuss other tuning knobs—such as twist angle across a broader family of van der Waals materials. Our results highlight a general theoretical framework for superconductivity-ferromagnetism competition in correlated Van Hove metals and outline experimental probes to test these predictions in twisted bilayer WSe<sub>2</sub> and beyond.</p>

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Competing superconductivity and valley ferromagnetism tuned by displacement field in Van Hove metals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Hyeok-Jun Yang,
  • Yi-Ting Hsu

摘要

Competing electronic orders are a hallmark of strongly correlated materials. In twisted bilayer WSe2, experiments have recently revealed a transition between superconductivity and correlated magnetism at van Hove filling, controlled by the displacement field. Here, we provide a theoretical framework for such a transition in two-dimensional hexagonal systems with spin-orbit coupling and van Hove singularities (VHS) at the Fermi level. Using a minimal model, we show that the displacement field tunes the effective interactions and drives a Stoner-like transition. A renormalization group analysis predicts that chiral d/p-wave superconductivity dominates at weak fields (D < Dc), while a valley ferromagnetic phase with spatially modulated magnetization at stronger fields (D > Dc). We discuss other tuning knobs—such as twist angle across a broader family of van der Waals materials. Our results highlight a general theoretical framework for superconductivity-ferromagnetism competition in correlated Van Hove metals and outline experimental probes to test these predictions in twisted bilayer WSe2 and beyond.