General(ized) Hartman effect

@article{Hasan2020GeneralizedHE,
  title={General(ized) Hartman effect},
  author={M Zahid Hasan and Bhabani Prasad Mandal},
  journal={Europhysics Letters},
  year={2020},
  volume={133}
}
In this letter we prove explicitly that if the Hartman effect exists for an arbitrary “unit cell” potential, then it also exists for a periodic system constructed using the same “unit cell” potential repeatedly. We further show that if the Hartman effect exists, the tunneling time in the limiting case of a sufficiently thick “unit cell” potential is the same as that of its periodic system. This is true for any arbitrary value of the intervening gap between the consecutive “unit cell” of the… 

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