On Mar 2, 2009, at 9:04 PM, Hassan Aghababaeian wrote:
I need to calculate group velocity of guided mode (or Group index)
in some geometry like line defects.
From froum I understood display-group-velocities command in MPB can
be useful. But I couldn't find what is output and how can be used?
When I extract Group velocities by: grep velocity *.out >
result.dat, the output is some vectores like:
velocity:, 1, #(0.0 0.0 0.0), #(…
velocity:, 2, #(0.546472273423393 0.31550526440082
7.60657916462197e-9), …
What do these vectors mean? How can I calculate group velocity of
guided mode?
As documented in the manual, they are the group velocities, in units
of c, in Cartesian coordinates, one line per k-point and one velocity
per band (comma separated). That is, the format is #(vx/c vy/c vz/c).
#(.....) is the Scheme way of printing any objects of the Scheme
"vector" type.
Stevne
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