I am studying a model with iDMRG and was wondering if I can extract correlation functions using iDMRG? I am interested in studying the possibility of a superconducting phase by studying the correlators. My initial lattice size is 2 (before iDMRG run). Also, is it possible to extract central charge using iDMRG? I have also tried analyzing my model using DMRG but it is difficult for it to converge.
Any suggestion will be really helpful.
Correlators using iDMRG
Re: Correlators using iDMRG
Yes, even if the MPS unit cell is 2, you can have correlations in the MPS way beyond those 2 sites.
You can for example call correlation_function with
And yes, you can also extract the central charge by a careful scaling analysis of the entanglement vs log(bond dimension), as illustrated in central_charge_ising.py, see also arXiv:0812.2903 (referenced in the example as pollman2009).
You can for example call correlation_function with
sites2=range(50) to calculate correlations up to site 50, or term_correlation_function_right.And yes, you can also extract the central charge by a careful scaling analysis of the entanglement vs log(bond dimension), as illustrated in central_charge_ising.py, see also arXiv:0812.2903 (referenced in the example as pollman2009).