LOCPROJ

LOCPROJ = <sites> : <functions-Ylm-specs> : <functions-radial-specs>
Default: LOCPROJ = None 

Description: by means of the LOCPROJ-tag one may specify a (set of) local function(s) on which the orbitals are to be projected. These projections are written to the PROJCAR, LOCPROJ, and vasprun.xml files.

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A valid LOCPROJ specification consists of three parts separated by colons (":"), above denoted as <sites>, <functions-Ylm-specs>, and <functions-radial-specs>. These parts define the sites on which the local functions are centered, specify their angular character, and their radial behaviour, respectively.

• <sites>

The sites on which the local functions are centered may be specified in two ways. One can use the index of the ionic positions as defined in the POSCAR file. For instance:

1 2 6-8

will select sites 1,2,6,7, and 8, as defined in the POSCAR file.

Alternatively one may specify a position in terms of direct coordinates of the real space lattice, for instance as:

(0.5, 0, 0)

These modes of specification may be mixed as well, for instance as:

1 (0.5, 0, 0) 8 

• <functions-Ylm-specs>

The angular character of the local functions on the specified sites. Valid specifications are:

s
p	py	pz	px
d	dxy	dyz	dz2	dxz	dx2-y2
f	fy(3x2-y2)	fxyz	fyz2	fz3	fxz2	fz(x2-y2)	fx(x2-3y2)
sp	sp-1	sp-2
sp2	sp2-1	sp2-2	sp2-3
sp3	sp3-1	sp3-2	sp3-3	sp3-4
sp3d	sp3d-1	sp3d-2	sp3d-3	sp3d-4	sp3d-5
sp3d2	sp3d2-1	sp3d2-2	sp3d2-3	sp3d2-4	sp3d2-5	sp3d2-6

The definition of the sp, sp2, sp3, sp3d, and sp3d2 hybrid functions is consistent with the definition used by WANNIER90 (see section 3.4 of the WANNIER90 manual).

These specifiers may be combined as well:

p sp-1 dxy

which is means: "put p functions (≡ p_x, p_y, and p_z), a sp-1 function, and a d_xy function on all sites specified in the <sites> part.

• <functions-radial-specs>

The radial part of the local functions may be of one of the three following types:

Pr: use the PAW projectors

Ps: use the PAW pseudo partial waves

Hy: use hydrogen-like (Slater type) functions (see section 3.4 of the WANNIER90 manual)

Caveat: when using radial functions derived from the PAW datasets, i.e., of type Pr or Ps, one can only specify pure spherical harmonics in the <functions-Ylm-specs> part. This means, s, p, d, f, and/or their separate constituents.

The radial specifiers may be modified using (optional) modification statements:

Pr [ n^th-of-l [ species-number ] ]

Ps [ n^th-of-l [ species-number ] ]

Hy [ n [ Z_α ] ]

• Examples

Combining the above, we might specify:

LOCPROJ = 1 : s : Hy

to put a hydrogenic 1s function on the first ionic position specified in the POSCAR file.

Related Tags and Sections

LORBIT