IALL IN ONE

IALL_IN_ONE = [integer]

Default: IALL_IN_ONE	= 1	for LALL_IN_ONE=.TRUE. or NBANDS<0
	= -1	for LALL_IN_ONE=.FALSE.

Description: IALL_IN_ONE>0 enables the all-in-one mode for many-body perturbation theory calculations, i.e., ALGO=ACFDT[R], [EV]GW0[R], GWR.

Mind: available as of VASP.6.4.0

In the all-in-one mode, VASP automatically performs the necessary DFT steps prior to the many-body perturbation theory (MBPT) calculation, i.e. a DFT calculation with NBANDS, followed by an exact diagonalization of the Kohn-Sham Hamiltonian with NBANDSEXACT bands. Note, NBANDSEXACT is set by default to the maximum number of plane-waves given by the chosen energy cutoff for the orbitals ENCUT. In the all-in-one mode, the actual GW/RPA calculation is also performed with NBANDSEXACT bands. If NBANDS_WAVE is not set, all orbitals are written to WAVECAR, which potentially becomes huge in file size.

Tip: The NBANDS_WAVE tag can be used to limit the number of bands written to WAVECAR if IALL_IN_ONE>0.

The all-in-one mode is automatically enabled for ALGO=[EV]GW[0]R, RPA[R],ACFDT[R] if NBANDS is not set.

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