xTAPP official web site

1.xTAPP forum (MateriApps)
2.Download xTAPP
3.Pseudo-potential database
Available in the above download page.

If you have a problem in using xTAPP such as a bug, please give a report to the following e-mail address:


Recent News

2017/5/16: Development version of xTAPP-170506-1 was released.
  • Fixed the problem in the output data of Wannier functions in the reciprocal space. This problem also means that the Wannier functions in the real space also had the problem. This miscalculated Wannier functions can be distinguished easily from the normal ones.
2017/5/6: Development version of xTAPP-170506 was released.
  • The problem in the treatment of symmetries for calculations of the non-collinear magnetism was fixed.
  • For calculations of the non-collinear magnetism, we can explicitly specify the time-reversal (spin-reversal) symmetry operation now. We can describe the magnetic space group now.
  • Mistakes to use single precision intrinsic functions in the code was fixed. The test by xTAPP-test set was not produced physically significant differences.
2016/7/15: Development version of xTAPP-160715 and xTAPP-util-160715 was released.
  • rok2dx was revised to function when spin-orbit support is enabled.
  • sym2xti.py was added. This tool converts the symmetry data generated by the symmetry detection function of phonopy. This tool is based on the code by Dr. K. Nakamura in Kyushu Institute of Technology. There is an example of the usage in tutorial.tex.
2016/6/29: Development version of xTAPP-160629 was released.
  • We can compute Wannier functions with spin-orbit and ultrasoft-pseudo-potentials. This also means we can compute spontaneous electric polarization using ultrasoft-pseudo-potential also. We can also use rhombohedral cells in the computation.
2016/6/14: Development version of xTAPP-util-160614 was released.
  • wfk2dx was revised to support spin-orbit interaction.
2016/4/20: Development version of xTAPP-160420 was released.
  • Spin-orbit interaction and non-collinear magnetism are supported.
  • Spin-orbit interaction and non-collinear magnetism are supported in stress calculations.
  • The internal representation of the wave functions are modified. This means that the rounding error will be different.