Akm = {{0, 0, (1/3)*(Eb1u + Eb2u + Eb3u)} , 
       {2, 0, (5/6)*((2)*(Eb1u) + (-1)*(Eb2u) + (-1)*(Eb3u))} , 
       {2,-2, (-5/2)*((1/(sqrt(6)))*(Eb2u + (-1)*(Eb3u)))} , 
       {2, 2, (-5/2)*((1/(sqrt(6)))*(Eb2u + (-1)*(Eb3u)))} }