How to compute single particle or spin excitation spectrum in momentum space by iMPS
Posted: 19 Sep 2023, 02:04
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.
Actually, I am not sure the difference between infinite boundary with translation invariance, and periodic boundary condition in thermodynamic limit.