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Name:QPdb
Short description: specifies the utilization of QP-corrections for X, G0, or K
Environment:(EXTQP)(Xd)(Xs)(BSK)(BSS)(G)
Default:"none"

Long description

The variable QPdb is one of two options to impose QP corrections. The other option utilizes scissors-shift for conduction band states and a stretch correction for the band width of the LDA band width of conduction and valence bands (cf. variable QP_E ).
QPdb enables the inclusion of QP corrections obtained in a preceding calculation as stored in db.QP file and applies them to the corresponding physical quantity (response function X, green's function G or BSE kernel K).
The general format of the QPdb string is The possible options for <WHAT> are while the only <OPTION> supported now is "iu" that activates the interpolation procedure for the missing QP states.

Example:
"E < example/db.qp" - QP-energy corrections will be read from the database file "db.qp" stored in the directory "example/".

Interpolation of missing QP-values

For a consistent calculation all states included either X, G, or K must be corrected on the same footing. However, to provide QP-values for all states via the QP-database may be to costly in some cases. Therefore, an interpolation of the missing QP-values on the basis of the QP-database is available via the token iu. For each band state at a given k-point the missing QP-value (E,Z, or W) will be calculated as an average of the values provided for the QP_N neighbouring k-points (i.e. those with smallest distance). The QP-values thus needs to be provided only at a number of k-points for the bands in question.