At t3=0 and at t1=t2=t3, the fused-pentagon tight-binding model has exact flat bands with analytic eigenstates, and the flatness persists approximately between these limits.
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Evolution of flat bands in two-dimensional fused pentagon network
At t3=0 and at t1=t2=t3, the fused-pentagon tight-binding model has exact flat bands with analytic eigenstates, and the flatness persists approximately between these limits.