Hello!(adsbygoogle = window.adsbygoogle || []).push({});

I am answering a problem which involves spins in the hamiltonian. The hamiltonian is given by H = B(a1Sz^(1) + a2Sz^(2)) + λS^(1)dotS^(2). The Sz^(1) and Sz^(2) refers to the Sz of the 1st and 2nd spins respectively. B is the magnetic field and the others are just constants. The question is to use the 2nd order perturbation theory to approximate the energy eigenvalues, given that the second term is the perturbing potential. Also it says that the problem is solvable exactly, so that the answer can be verified. I haven't been exposed to spins and its hamiltonian or eigenvalues. Please suggest a detailed way of attacking this proble. Thanks a lot!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# 2nd order perturbation calculation for a system involving spins

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**