CMT Forum Prof. Boris Altshuler

18 Jan 2023
Seminars and colloquia
Time
Knowledge of physics?
Yes, knowledge of physics required
Title:

How strong can the electron-phonon interaction in metals be?

 

Abstract:

 

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. We’ll compare the bounds on λ and Tc with existing experimental data.