the method is useful if there is a group of narrow bands that you want
to project on (typically the case when you want to apply U).
so look to your band structure and chose first_band (last_band) somewhat
below (above) the peak in the density of state that you want to describe
with the WFs.
Play around with them and see how results depend on the choice.
If the peak is well isolated it should
not be too sensitive to the choice.
However when the localized orbitals have significant hybridization with
the other states in the crystal the WF construction will be sensitive to
the choice of the energy window used. On the other hand simple DFT+U
method is not expected to work well in this case.
best
stefano
On 31/10/2015 06:54, paresh rout wrote:
Dear all,
Does any body know how to choose first_band and last_band limit for
the poormanwannier approach in Hubbard U calculation ? Any help
would be highly appreciated .
Paresh Chandra Rout
Research Scholar
Indian Institute of Science education and Research Bhopal
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