LRPAFORCE

LRPAFORCE = .TRUE. | .FALSE.
Default: LRPAFORCE = .FALSE.

Description: LRPAFORCE=.TRUE. calculates forces in the random-phase approximation (RPA).

Available as of VASP.6.1.

This tag can be optionally set in low-scaling RPA calculations or GW calculations. It allows computing the RPA forces on each ion. For instance,

ALGO = RPAR ;  LRPAFORCE = .TRUE.

computes the RPA total energy with corresponding forces, while

ALGO = G0W0R ; LRPAFORCE = .TRUE.

determines in addition the quasiparticle energies within the GW approximation.

The LRPAFORCE tag can be used in combination with the standard relaxation options IBRION and NSW.

Mind: The RPA stress tensor is not available.

Warning: Only ISIF=0 is supported.

Warning: RPA forces for metals are currently not supported.

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