Matrix H in Subspace 83 with Dimension 4
H is the Hamiltonian. Here we set µ=0. For grand-canonical calculations add -6µ to the main diagonal.
U
-2*Sqrt[2]*t
0
0
-2*Sqrt[2]*t
U
-2*t
0
0
-2*t
U
-2*Sqrt[2]*t
0
0
-2*Sqrt[2]*t
0