Matrix product state recursion methods for computing spectral functions of strongly correlated quantum systems

@article{Tian2020MatrixPS,
  title={Matrix product state recursion methods for computing spectral functions of strongly correlated quantum systems},
  author={Yifan Tian and Steven R. White},
  journal={arXiv: Strongly Correlated Electrons},
  year={2020}
}
We present a method for extrapolation of real-time dynamical correlation functions which can improve the capability of matrix product state methods to compute spectral functions. Unlike the widely used linear prediction method, which ignores the origin of the data being extrapolated, our recursion methods utilize a representation of the wavefunction in terms of an expansion of the same wavefunction and its translations at earlier times. This recursion method is exact for a noninteracting Fermi… 

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