Direct observation of electron propagation and dielectric screening on the atomic length scale

@article{Neppl2015DirectOO,
  title={Direct observation of electron propagation and dielectric screening on the atomic length scale},
  author={Stefan Neppl and Ralph Ernstorfer and A. L. Cavalieri and Christoph Lemell and Georg Wachter and Elisabeth Magerl and Elisabeth M. Bothschafter and Michael Jobst and Mark Hofstetter and Ulf Kleineberg and Johannes V Barth and Dirk Menzel and J. Burgd{\"o}rfer and Peter Feulner and Ferenc Krausz and Reinhard Kienberger},
  journal={Nature},
  year={2015},
  volume={517},
  pages={342-346}
}
The propagation and transport of electrons in crystals is a fundamental process pertaining to the functioning of most electronic devices. Microscopic theories describe this phenomenon as being based on the motion of Bloch wave packets. These wave packets are superpositions of individual Bloch states with the group velocity determined by the dispersion of the electronic band structure near the central wavevector in momentum space. This concept has been verified experimentally in artificial… CONTINUE READING

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