Skip to content

Files

Latest commit

 

History

History
11 lines (7 loc) · 546 Bytes

README.md

File metadata and controls

11 lines (7 loc) · 546 Bytes

Excited State Forces

Excited state forces code. Calculate forces after excitation by combining results from GW/BSE and DFPT calculations.

The excited force expression is given by:

[ F = \sum_{\nu cvc'v' k} A_{cvk} A^*{c'v'k} (g^{\nu}{cc'k} - g^{\nu}_{vv'k}) \hat{\nu} ]

where (\hat{\nu}) is one displacement pattern (a phonon mode for example), (A_{cvk}) is the exciton coefficient obtained from the Bethe-Salpeter Equation, and (g^{\nu}{ijk}) is the electron-phonon coefficient (\langle ik | \partial{\nu} V | ij \rangle).