通过二次能带接触湮灭的波前-位错演化
Wavefront-Dislocation Evolution via Quadratic Band Touching Annihilation
AI总结：
研究通过二次能带接触湮灭揭示波前位错演化由赝自旋缠绕主导，而非拓扑电荷。
摘要：
波前位错（WDs）——在准粒子干涉（QPI）实验中观测到的相奇点——已被广泛解释为石墨烯家族系统中 Berry 阶元的确定性实空间特征。在这里，我们分离了拓扑电荷和赝自旋纹理在 WD 实验中的作用。通过研究双层石墨烯和磁自旋轨道石墨烯系统中二次能带接触（QBTs）的不同湮灭方式，我们证明 WD 演化仅由底层赝自旋缠绕的变化所支配，而对能带接触本身的拓扑电荷（即涡旋度）不敏感。我们的结果表明，WD 测量的是波函数赝自旋纹理，而不是拓扑电荷的诊断，并提供了可以在其中工程和观测 WD 演化的固态平台。
英文摘要：
Wavefront dislocations (WDs) -- phase singularities observed in quasiparticle interference (QPI) experiments -- have been widely interpreted as the definitive real-space signatures of Berry phases in graphene-family systems. Here, we disentangle the roles of topological charge and pseudospin texture in WD experiments. By investigating various way of the annihilation of quadratic band touchings (QBTs) in bilayer graphene and magneto-spin-orbit graphene systems, we demonstrate that WD evolution is governed exclusively by changes in the underlying pseudospin winding, while remaining insensitive to the topological charge (i.e., vorticity) of the band touching itself. Our results imply that WD measures wavefunction pseudospin texture rather than a diagnostic of topological charge and provide solid-state platforms in which WD evolution can be engineered and observed.
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