Fast Real-Axis Eliashberg Calculations: Full-bandwidth solutions beyond the constant density of states approximation
This paper introduces an efficient, linear-scaling numerical method for solving finite-temperature Migdal-Eliashberg equations directly on the real-frequency axis with full-bandwidth electronic structure and particle-hole asymmetry, thereby eliminating the need for unstable analytic continuation and yielding more accurate superconducting properties that align closely with experimental observations.
Alejandro Simon, James Shi, Dominik Spath, Eva Kogler, Reed Foster, Emma Batson, Pedro N. Ferreira, Mihir Sahoo, Phillip D. Keathley, Warren E. Pickett, Rohit Prasankumar, Karl K. Berggren, Christoph (…)2026-03-20🔬 cond-mat