Matrix t*K(1) in Subspace 46 with Dimension 3

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

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