Tootfinder

Polarons with arbitrary nonlinear electron-phonon interaction
Stefano Ragni, Tomislav Mi\v{s}ki\'c, Thomas Hahn, Nikolay Prokof'ev, Osor S. Bari\v{s}i\'c, Naoto Nagaosa, Cesare Franchini, Andrey S. Mishchenko
https://arxiv.org/abs/2506.17914

Polarons with arbitrary nonlinear electron-phonon interaction
We develop an exact computational method based on numerical X-propagators for solving polaron models with arbitrary nonlinear couplings of local vibration modes to the electron density and magnitude of the hopping amplitude. Our approach covers various polaron models, some of which were impossible to treat by any existing approximation-free techniques. Moreover, it remains efficient in the most relevant but computationally challenging regime of phonon frequencies much smaller than the electron …