Homework Statement
Given is a hamiltionan H0:
E1 0
0 E2
with E1 and E2 being eigenvalues of two eigenstates phi1 and phi2
A distortion W, with W12 = W21* (complex conjugate):
0 W12
W21 0
Calculate the eigenvalues and eigenstates of H = H0 + W
Homework...