• full name: tenpy.models.spins_nnn

  • parent module: tenpy.models

  • type: module



Spin-S sites coupled by (next-)nearest neighbour interactions on a GroupedSite.


Spin-S sites coupled by next-nearest neighbour interactions.

Module description

Next-Nearest-neighbour spin-S models.

Uniform lattice of spin-S sites, coupled by next-nearest-neighbour interactions. We have two variants implementing the same hamiltonian. The first uses the GroupedSite to keep it a NearestNeighborModel suitable for TEBD, while the second one just involves longer-range couplings in the MPO. The second one is preferable for pure DMRG calculations.