Dynamical Approach to Realize Room-Temperature Superconductivity in LaH${}_{10}$

Abstract

Metallic hydrogen and hydride materials stand as promising avenues to achieve room-temperature superconductivity. Characterized by their high phonon frequencies and moderate coupling strengths, several high-pressure hydrides were theoretically predicted to exhibit transition temperatures ($T_c$) exceeding 250\,K, a claim further substantiated by experimental evidence. In an effort to push $T_c$ beyond room temperature, we introduce a dynamical method that involves stimulating hydrides with mid-infrared lasers. Employing Floquet first-principles simulations, we observe that in a nonequilibrium state induced by light, both the electronic density of states and the coupling to high-energy phonons see notable enhancements. These simultaneous improvements collectively result in an estimated 20\%-30\% rise in $T_c$ in practical pump conditions. Our theoretical investigation, therefore, offers a novel strategy to potentially raise the $T_c$ of hydrides above room temperature.

11 pages, 6 figures