Authors
Yang Yang, Da-Qiang Chen, Xuan-De Bu, Chao Lian, Sheng Meng
Published in
Physical review letters. Volume 137. Issue 14. Pages 146902. Oct 02, 2026.
Abstract
Ultrafast modulation of electron-phonon couplings via laser excitation has been experimentally demonstrated, yet a clear microscopic understanding remains elusive. Here, we establish the first ab initio framework combining time-dependent density-functional theory, density-functional perturbation theory, and Migdal-Eliashberg theory to track electron-phonon couplings and superconductivity in prototypical phonon-mediated superconductor MgB_{2} under laser illumination. We find that near-infrared laser pulses induce charge transfer from boron σ to π orbitals, effectively renormalizing the electron-phonon couplings and boosting the superconducting critical temperature to ∼52 K. The simulated thermalized superconducting gaps match well with experimental measurements. We propose a generalizable route for ultrafast modulation of superconductivity in materials whose dominant electron-phonon coupling channel can be selectively addressed by light, with photoinduced changes in electronic coupling and screening playing a central role. This Letter offers fundamental insight into nonequilibrium optical control of electron-phonon interactions and superconductivity, and provides a predictive tool for studying photo-modulated electron-phonon coupling and macroscopically observable superconducting properties.
PMID:
42886918
Bibliographic data and abstract were imported from PubMed on 17 Oct 2026.
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