Matrix H in Subspace 77 with Dimension 4
H is the Hamiltonian. Here we set µ=0. For grand-canonical calculations add -6µ to the main diagonal.
2*U
-2*t
-2*Sqrt[2]*t
0
-2*t
2*U
0
2*Sqrt[2]*t
-2*Sqrt[2]*t
0
2*U
0
0
2*Sqrt[2]*t
0
3*U