[latest]

The following changes are in the github repository, but not yet released. The contents are auto-generated from multiple files.

  • Support MPS with unknown singular values, i.e. with None in mps._S.

  • Add tenpy.networks.mpo.MPO.from_Wflat().

  • Fix hdf5 loading for MPS and MPO. They were not backwards compatible and could not load files from tenpy<1.1.0

  • Add ArnoldiEvolution, similar to LanczosEvolution, to support evolution under non-Hermitian effective Hamiltonians

  • Enable TDVP with non-Hermitian Hamiltonians

  • Fix typo in the computation of the unit_cell_width during extract_segment().

  • Add explicit normalizations during canonical_form_finite() that stabilize it for MPS with small norm, see issue #596.

  • Improved tenpy.algorithms.exact_diag.get_numpy_Hamiltonian() by setting the cutoff for exponentially decaying terms to 0 (increasing accuracy)

  • Fixed an error where TDVP did not correctly handle explicit_plus_hc. Before, the flag was considered in the two-site update, but ignored in the one-site update for TwoSiteTDVP. For SingleSiteTDVP, it was considered in the one-site update, but ignored in the zero-site update. Using a model with explicit_plus_hc in TDVP thus led to an incorrect computation. However, in the test cases we used, this led to a barrage of loud warnings from the Lanczos evolution, and thus was not silent.