近日，美国哥伦比亚大学Dean, Cory R.团队报道了扭曲双层WSe2超导相图的角度演化。2026年4月1日，《自然》杂志发表了这一成果。

最近在扭曲双层WSe2中观测到的超导电性，将莫尔超导体的家族从扭曲石墨烯扩展到了过渡金属硫族化合物。在WSe2中，已研究了两个不同的扭曲角——3.65°（文献1）和5.0°（文献2），并报道了两个看似截然不同的超导相图，这引发了一个问题：这两个器件中的超导相是否具有相似的起源。

研究组通过实验绘制了覆盖初始报道所界定范围内的多个扭曲角度器件的相图演化，并将结果与依赖于扭曲角度的理论进行比较，从而回答了这一问题。结果发现，超导态随扭曲角度平滑演化，并且在所有角度下，超导态都邻近于费米面重构（可能伴随反铁磁有序），但并不一定与范霍夫奇点或半能带绝缘体相关联。

该结果将先前看似独立的3.65°和5°相图联系起来，并为该体系中超导电性的起源及其随关联强度增加而演化提供了新的见解。更广泛地说，平滑的相图演化、不同器件之间的可重复性以及每个器件内部的动态栅压可调性，确立了扭曲过渡金属硫族化合物作为一个独特的平台，用于研究相互作用强度与带宽之比变化时的关联相。

附：英文原文

Title: Angle evolution of the superconducting phase diagram in twisted bilayer WSe2

Author: Guo, Yinjie, Cenker, John, Fischer, Ammon, Muoz-Segovia, Daniel, Pack, Jordan, Holtzman, Luke, Klebl, Lennart, Watanabe, Kenji, Taniguchi, Takashi, Barmak, Katayun, Hone, James, Rubio, Angel, Kennes, Dante M., Millis, Andrew J., Pasupathy, Abhay, Dean, Cory R.

Issue&Volume: 2026-04-01

Abstract: Recent observations of superconductivity in twisted bilayer WSe2 (refs.1,2) have extended the family of moiré superconductors beyond twisted graphene3,4,5,6,7,8,9,10,11,12,13,14,15. In WSe2, two different twist angles were studied, 3.65° (ref.1) and 5.0° (ref.2), and two seemingly distinct superconducting phase diagrams were reported, raising the question of whether the superconducting phases in the two devices share a similar origin. Here we address the question by experimentally mapping the evolution of the phase diagram across devices with twist angles spanning the range defined by the initial reports and comparing the results to twist angle-dependent theory. We find that the superconducting state evolves smoothly with twist angle and at all twist angles is proximal to a Fermi surface reconstruction with, presumably, antiferromagnetic ordering, but is neither necessarily tied to the Van Hove singularity nor to the half-band insulator. Our results connect the previously distinct phase diagrams at 3.65° and 5°, and offer new insight into the origin of the superconductivity in this system and its evolution as the correlation strength increases. More broadly, the smooth phase diagram evolution, repeatability between different devices and dynamic gate tunability within each device establish twisted transition metal dichalcogenides as a unique platform for the study of correlated phases as the ratio of interaction strength to bandwidth is varied.

DOI: 10.1038/s41586-026-10357-2

Source: https://www.nature.com/articles/s41586-026-10357-2