[Pw_forum] Electron-Phonon Interaction in Insulators

[Samuel Smith]

Hello,
My group is interested in using Quantum Espresso for the calculation of the electron-phonon interaction in insulators and semiconductors.  We realize that the built in methods as described in the manual to calculate the lambda and a2f values are ill-defined for insulators, but we are still interested in the electron-phonon coefficients g as described in Appendix A of the PHonon user manual. I see where this is calculated in the code, but I am not sure precisely how to extract it.  Is this parameter well-defined and usable for insulators and semiconductors? Are there any symmetry-related reweighings that must be applied if I just dump the matrix? Thank you very much for your help.

Sincerely,
Samuel Smith

Graduate Student
Laboratory for Emerging and Exploratory Devices
Department of Electrical Engineering and Computer Sciences
University of California, Berkeley