Figure 1: Electronic structures before and after K dosing for a 30 uc FeSe film on SrTiO 3. Figure 2: Superconducting gaps in K-dosed FeSe films with varied thicknesses and that of K-dosed FeSe 0.93 S ...

Using an advanced Monte Carlo method, Caltech researchers found a way to tame the infinite complexity of Feynman diagrams and solve the long-standing polaron problem, unlocking deeper understanding of ...