EPW Forum

Dear all We konw some superconductors have a large λ but a low Tc, some have a small λ but a high Tc. Why they are different? From the Eliashberg equations, we kown renormalization function is associate with the λ and Tc. Is it because λ contributes to mass renormalization in system with large λ low...

Dear sir We know that anisotropic Eliashberg equations are composed of the superconducting gap Δ(k,iω_n ), the renormalization function Z(k,iω_n ), the EPC λ, and the Temperature T. Can anyone tell me how the renormalization function Z(k,iω_n ) effects on the λ and the Tc ? I find some materials hav...

Dear all I plot the XX.fs.frmsf and XX.imag_aniso_gap0_005.00.frmsf files using the Fermisurfer program. They are different in bands. Does the XX.imag_aniso_gap0_005.00.frmsf file plot some gaps not on the Fermi surface or these gaps are not convergent? I think the Fermi surface shoud be same plot b...

Dear all When I calculate the Eliashberg spectral function in EPW and PHonon(the module in QE), I found they are different. Especially, the DOS near 0 frequency jumps sharply in EPW but not in PHonon. And the lambda caculated in EPW seems too large, so strange! Maybe something wrong in the Phonon sp...

Hello Everybody I run the ph.x to calculate phonon dispersion separate single q point in different machine for faster. And after that, I collect the "dyn dvscf" file for running EPW by manual. (which can collect by the pp.py script automatically if calculate q in normal ways).Then when I run epw.x, ...