Matrix t*K(1) in Subspace 100 with Dimension 3

(K(1) is the first-order Grosse operator)

0 ((1 - I*Sqrt[3])*U)/Sqrt[2] (I*(3*I + Sqrt[3])*t)/Sqrt[2]
((-1 - I*Sqrt[3])*U)/Sqrt[2] I*Sqrt[3]*t (U - I*Sqrt[3]*U)/2
((3 + I*Sqrt[3])*t)/Sqrt[2] (-U - I*Sqrt[3]*U)/2 (-I)*Sqrt[3]*t