1. how strong can the electron-phonon interaction in metals be?

Emil Yuzbashyan

Rutgers University, USA

3 November 2022 Thu 4 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

I’ll show that the dimensionless electron-phonon coupling λ cannot exceed a certain critical value in metals. Increasing λ beyond this value leads to a structural instability accompanied by a metal-insulator transition. This also implies an upper bound on the superconducting Tc in units of the characteristic phonon frequency in conventional superconductors. We’ll compare the upper bounds on λ and Tc with existing experimental data.