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发帖数: 1702 | 1 The problem is how to describe the Bragg reflection in a checkerboard
structure.
For example the system is A-B-A-B-A-B-A-B two sublattice structure, we have
onsite potential at A. there is no potential on B. this is Sys 1.
Compare the two sublattices system to a one sublattice system, which is
A- -A- -A- -. Let's call this Sys 2.
Absolutely when electron flow in these two systems, the situations should be
different. Electrons should get Bragg reflection in Sys 1, this is the
difference. But can any one explain in the momentum space how to describe
the Bragg reflection here?
不胜感激。 |
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