the hamiltonian is(adsbygoogle = window.adsbygoogle || []).push({});

H=-J \sum_{l=1}^N \sigma_l^z \sigma_{l+1}^z+ g \sigma_l^x

here we assume periodic boundary condition

my problem is, what is the highest possible degeneracy of the levels?

initially i expected 2

but numerically i find that it is 4

i cannot understand it

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# Level degeneracy of the transverse ising model

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