On May 20, 2008, at 6:05 PM, Mindy Lee wrote:
> If I only want to calculate the energy integral in the air region
> inside the donut like defect hole how do I define the object? Do I
> write it in a following way?
To compute the enrgy inside an annulus ("donut") with compute-energy-
in-objects, there are two ways:
1) compute the energy in the donut+hole, and then compute the energy
in the hole, and subtract the two numbers.
2) call compute-energy-in-objects with two objects, one for the object
and one for the hole, where the material for the hole is specified as
(material nothing). The hole must be the *second* object (because in
MPB, later objects always take precedence over earlier ones). This is
an undocumented feature.
>
> Another question is when I use (compute-energy-in-objects
> objects...) and if I choose the object as the entire unit cell, how
> do I define the object? same way as I set the geometry? And is the
> result the same as if I use (compute-energy-integral)?
You can just make the object a sphere with infinite radius, for
example. But the result should be identical to compute-energy-integral.
Steven
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