How to compute single particle or spin excitation spectrum in momentum space by iMPS

How do I use this algorithm? What does that parameter do?
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swish47
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Joined: 19 Sep 2023, 01:57

How to compute single particle or spin excitation spectrum in momentum space by iMPS

Post by swish47 »

We know that one can obtain ground state iMPS through iDMRG or iTEBD if setting infinite boundary condition. I am wondering is it possible to compute spectrum in momentum space (for example single particle dispersion or spin excitation spectrum) from local operators and known ground state?
Actually, I am not sure the difference between infinite boundary with translation invariance, and periodic boundary condition in thermodynamic limit.
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