Boris Altshuler

Columbia University, USA

27 April 2023 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                     

Analyzing the electron-phonon interaction in metals in the framework of the Migdal-Eliashberg approach we found that the dimensionless electron-phonon coupling λ cannot exceed a certain critical value (approximately 3.7). Increasing λ beyond this value leads to an instability which is likely to be accompanied by a metal-insulator transition. This also implies an upper bound on the superconducting Tc. I will compare the bounds on λ and Tc with existing experimental data.

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