IPEAD
IPEAD = 1 | 2 | 3 | 4
Default: IPEAD = 4
Description: IPEAD specifies the order of the finite difference stencil used to compute the derivative of the cell-periodic part of the orbitals w.r.t. k in the PEAD approach.
|∇kunk⟩ (LPEAD=.TRUE.), or
Related Tags and Sections
LPEAD, LCALCEPS, EFIELD_PEAD, Berry phases and finite electric fields