Find the eigenvector with zero eigenvalues at any time t from the Hamiltonian

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Homework Statement:
A Hamiltonian of 3 level system is given by:
Relevant Equations:
H= Acos^2 bt(|1><2|+|2><1|)+Asin^2 bt(|2><3|+|3><2|)

I have been asked to find that H has an eigenvector with zero eigenvalues at any time t, but I don't know where to start
I have a question relates to a 3 levels system. I have the Hamiltonian given by:

H= Acos^2 bt(|1><2|+|2><1|)+Asin^2 bt(|2><3|+|3><2|)

I have been asked to find that H has an eigenvector with zero eigenvalues at any time t
 

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PeroK
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Homework Statement: A Hamiltonian of 3 level system is given by:
Homework Equations: H= Acos^2 bt(|1><2|+|2><1|)+Asin^2 bt(|2><3|+|3><2|)

I have been asked to find that H has an eigenvector with zero eigenvalues at any time t, but I don't know where to start

I have a question relates to a 3 levels system. I have the Hamiltonian given by:

H= Acos^2 bt(|1><2|+|2><1|)+Asin^2 bt(|2><3|+|3><2|)

I have been asked to find that H has an eigenvector with zero eigenvalues at any time t

You have to make your best attempt. You must know something about eigenvectors and eigenvalues.

We can't help you if you simply know nothing about the material at all.
 

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