Criticality Across the Energy Spectrum from Random, Artificial Gravitational Lensing in Two-Dimensional Dirac Superconductors
The study numerically investigates how weak, random spatial velocity modulation in 2D massless Dirac materials acts as quenched gravitational disorder (QGD). It found that most states transform into a universal quantum-critical "stack" with energy-independent fluctuations. This model explains the division between coherent and incoherent excitations observed in cuprate superconductors.