Infinite boundary conditions for matrix product state calculations

@article{Phien2012InfiniteBC,
  title={Infinite boundary conditions for matrix product state calculations},
  author={Ho N. Phien and Guifr{\'e} Vidal and I. P. McCulloch},
  journal={Physical Review B},
  year={2012},
  volume={86},
  pages={245107}
}
We propose a formalism to study dynamical properties of a quantum many-body system in the thermodynamic limit by studying a finite system with "infinite boundary conditions" where both finite-size effects and boundary effects have been eliminated. For one-dimensional systems, infinite boundary conditions are obtained by attaching two boundary sites to a finite system, where each of these two sites effectively represents a semi-infinite extension of the system. One can then use standard finite… 

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