Matrix H-123

Matrix H in Subspace 123 with Dimension 4

H is the Hamiltonian. Here we set µ=0. For grand-canonical calculations add -6µ to the main diagonal.

2*h + U	-(Sqrt[2]*t)	2*t	0
-(Sqrt[2]*t)	2*h + U	0	-t
2*t	0	2*(h + U)	Sqrt[2]*t
0	-t	Sqrt[2]*t	2*(h + U)