Without knowing your system, it is impossible to comment on whether the
concept of local charge exists, meaningfully. Can you specify your system?
For example, there is no such thing as a widely-accepted method to
calculate local charge because the concept of local charge does not
exist, rigorously. No law of physics demands that electrons are "owned"
by a certain atom (Coulomb's law neither knows nor cares about the human
concept of atoms). In some cases, electrons' positions happen to be
relatively localized (like, say average organic molecules), and the term
has more meaning. If we are talking about a highly delocalized system,
the term has no meaning (because the electrons don't "belong" to anyone).
On 8/11/18 3:25 PM, Comer, Benjamin M wrote:
Mr. Hosseini,
I am not sure what type the local charges and magnetizations QE prints
by default, but you should use a widely accepted method to calculate
local charges, such as Bader analysis. I should note that there is no
“correct” way to calculate a local charge. However, there are many
ways to calculate charges developed by the community, each with it’s
own drawbacks (see Wikipedia link below.) I’d recommend using Bader
charges, DDEC6, or the lowden charges printed out from the projwfc.x
code in the quantum espresso suite(links below.)
https://en.wikipedia.org/wiki/Partial_charge
http://theory.cm.utexas.edu/henkelman/code/bader/
https://sourceforge.net/projects/ddec/files/
http://phya.snu.ac.kr/~nmcuong/board/physics/INPUT_PROJWFC.html
<http://phya.snu.ac.kr/%7Enmcuong/board/physics/INPUT_PROJWFC.html>
Hope it helps,
Ben Comer
Georgia Tech
>Dear All
>
>I need to compute local charge of atoms in my unit cell. As I checked, the
output of SCF provides local charge with the corresponding
>magnetization. The numbers are confusing. How can I compute the local
charge?
>
>M.R.Hosseini
>Tarbiat Modares University, Department of Chemistry, Iran
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