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Fully relativistic pseudopotentials

Fully relativistic pseudopotentials (for s and p-states) generated by
the MBK (PRB 47, 6728 (1993)) scheme within LDA (CA13) and GGA (PBE13) which contain
a partial core correction and fully relativistic effects including spin-orbit coupling.

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Pseudo-atomic orbitals

The number below the symbol means a cutoff radius (a.u.) of the confinement
potential. These file includes fifteen radial parts for each angular
momentum quantum number l (=0,1,2,3). The basis functions were generated by variationally
optimizing the corresponding primitive basis functions in the single atom and the BCC structure.
The input files used for the orbital optimization can be found at
As_opt.dat
and
Asbcc_opt.dat.
Since As_CA13.vps and As_PBE13.vps include the 3d, 4s and 4p states (15 electrons)
as the valence states, the minimal basis set is As*.*-s1p1d1.
Our recommendation for the choice of cutoff radius of basis functions is that
As7.0.pao is enough for bulks, but As9.0.pao or As11.0.pao is preferable for molecular systems.

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Benchmark calculations by the PBE13 pseudopotential with the various basis functions

**(1) Calculation of the total energy as a function of lattice constant in the bcc structure,**
where the total energy is plotted relative to the minimum energy for each case. a_{0}
and B_{0} are the equilibrium lattice constant and bulk modulus obtained by fitting to
the Murnaghan equation of state. The difference between As7.0-s3p3d3f2 and As7.0-s4p4d3f2
in the total energy at the minimum point is 0.0052 eV/atom.
An input file used for the OpenMX calculations can be found at
Asbcc-EvsV.dat.
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 9.1 of Wien2k except for
the use of R_{MT} x K_{MAX} of 12.

**(2) Calculations of the band dispersion in the bcc structure,**
where the non-spin polarized collinear calculation with the lattice constant of 3.37 Ang.
was performed using As_PBE13.vps and As7.0-s3p3d3f2,
and the origin of the energy is taken to be the Fermi level.
The input file used for the OpenMX calculations can be found at
Asbcc-Band.dat.
For comparison the result by the Wien2k code is also shown, where
the calculation was performed by default setting in the Ver. 9.1 of Wien2k
except for the use of R_{MT} x K_{MAX} of 12.