### Bipartitioning infinite MPS into 2 semi-infinite chains

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**22 May 2020, 21:23**I'm trying to compute the Resta Polarization of a Fermionic SSH chain according to the method described in https://arxiv.org/pdf/1810.07043.pdf equations 13-15. In particular, I need to compute 'particle imbalance' by partitioning the system into 2 semi-infinite chains, and tracing out one of these to get components of the reduced density matrix. When I use the function, I end up getting a trivial 2x2 matrix, and I'm pretty sure I'm not accurately cutting the system into semi-infinite chains.

Does anyone know how to bipartition an infinite MPS into 2 semi-infinite chains so that I can compute the Resta polarization?

Thank you in advance for the help

Code: Select all

`get_rho_segment([0], 1)`

Does anyone know how to bipartition an infinite MPS into 2 semi-infinite chains so that I can compute the Resta polarization?

Thank you in advance for the help