Dear Sophie,
One reason why the intraband and interband velocities are computed in
separate parts of the code may be that, in the specific projects for
which those parts of the code were originally written, the full velocity
matrix was not needed. For example, in the paper you mention the
intraband velocity is used for the low-field Hall coefficient in Sec.
III, and the interband velocity is used for the interband magnetic
circular dichroism in Sec. IV.
The other justification may be that the full optical conductivity is
usually separated into intraband and interband parts, which are then
computed separately.
But I agree that it might make sense to give the option to to compute
the full velocity matrix. And if you have an application in mind that
would benefit from that option, that could be a good reason to do it.
Perhaps the discussion of how to go about implementing this could take
place on the GitHub page of the code, e.g., by raising an issue or
making a pull request.
Best,
Ivo Souza
Centro de Fisica de Materiales
San Sebastian, Spain
On Thu, 8 Jul 2021, Sophie Beck wrote:
Dear All,
I would like to compute the elements of the full velocity matrix (Eq. 18 in
YWVS07), i.e. including contributions of both 1) diagonal intraband and 2)
off-diagonal interband on a given list of k-points. I have seen that both
contributions are already implemented: 1) is easily available on a given
k-mesh from geninterp.f90 and 2) is used in berry.f90.
I was wondering if there is a particular reason that I am overlooking as to
why there is no option to compute the full velocity matrix. If this is not
the case, I suppose that geninterp.f90 could be a reasonable place to add
this?
Thanks in advance for your feedback.
Best,
Sophie Beck
--
Flatiron Research Fellow
Center for Computational Quantum Physics
Flatiron Institute, Simons Foundation
162 5th Ave, New York, NY 10010
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