Matrix H in Subspace 101 with Dimension 8

H is the Hamiltonian. Here we set µ=0. For grand-canonical calculations add -6µ to the main diagonal.
U 0 ((-3*I)/4)*(-I + Sqrt[3])*t (I/2)*Sqrt[3]*t ((3*I)/2)*t 0 0 (-3*(-I + Sqrt[3])*t)/4
0 2*U ((3 + I*Sqrt[3])*t)/4 0 0 0 0 ((-3*I + Sqrt[3])*t)/4
((3*I)/4)*(I + Sqrt[3])*t ((3 - I*Sqrt[3])*t)/4 2*U 0 0 -((-3*I + Sqrt[3])*t)/4 ((3*I + Sqrt[3])*t)/4 0
(-I/2)*Sqrt[3]*t 0 0 U 0 -(Sqrt[3]*t)/2 -((-3*I + Sqrt[3])*t)/2 0
((-3*I)/2)*t 0 0 0 U t/2 (I/2)*(I + Sqrt[3])*t 0
0 0 -((3*I + Sqrt[3])*t)/4 -(Sqrt[3]*t)/2 t/2 U 0 ((5 + I*Sqrt[3])*t)/4
0 0 ((-3*I + Sqrt[3])*t)/4 -((3*I + Sqrt[3])*t)/2 (-I/2)*(-I + Sqrt[3])*t 0 2*U (t + (3*I)*Sqrt[3]*t)/4
(-3*(I + Sqrt[3])*t)/4 ((3*I + Sqrt[3])*t)/4 0 0 0 ((5 - I*Sqrt[3])*t)/4 (t - (3*I)*Sqrt[3]*t)/4 2*U