# Homework Help: A question about band structure silicene

1. Jun 28, 2015

### anahita

Dear forum people
I consider four atomic orbitals of the silicon atom: s, px , py and pz , thus Hi,j is a 4*4 matrix.
Hi,i is the expression of the diagonal matrix and Hi,j is the expression off-diagonal matrix where the expression for Hi,i and Hi,j is attached.
But I can not calculate the cosine of direction.
Who can help me find the cosine of direction?

File size:
16.4 KB
Views:
52
2. Jul 3, 2015