Quantum geometry and critical temperature enhancement in MgB${}_2$ superconductivity

Yi Jiang, Haoyu Hu, Dumitru Călugăru +13

MgB${}_2$, a phonon-mediated superconductor with record-high critical temperature $T_c\simeq 39$ K, is revisited to obtain a comprehensive theory of electrons, phonons, and their cou…