Computing dynamic spin structure factor using matrix product state method and the time dependent variational principle

We demonstrate that matrix product state combined with the time dependent variational principle can accurately reproduce a real time evolution of a disturbed ground state. From real time correlation of spin operators respect to the ground state, we compute the dynamic spin structure factor. We will show benchmark results for 1d Heisenberg chain, as well as extensive calculations on 2d square lattice Heisenberg model.