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@ARTICLE{Cardenas:862770,
      author       = {Cardenas, D. E. and Ostermayr, T. M. and Di Lucchio, L. and
                      Hofmann, L. and Kling, M. F. and Gibbon, P. and Schreiber,
                      J. and Veisz, L.},
      title        = {{S}ub-cycle dynamics in relativistic nanoplasma
                      acceleration},
      journal      = {Scientific reports},
      volume       = {9},
      number       = {1},
      issn         = {2045-2322},
      address      = {[London]},
      publisher    = {Macmillan Publishers Limited, part of Springer Nature},
      reportid     = {FZJ-2019-03005},
      pages        = {7321},
      year         = {2019},
      abstract     = {The interaction of light with nanometer-sized solids
                      provides the means of focusing optical radiation to
                      sub-wavelength spatial scales with associated electric field
                      enhancements offering new opportunities for multifaceted
                      applications. We utilize collective effects in nanoplasmas
                      with sub-two-cycle light pulses of extreme intensity to
                      extend the waveform-dependent electron acceleration regime
                      into the relativistic realm, by using 10**6 times higher
                      intensity than previous works to date. Through irradiation
                      of nanometric tungsten needles, we obtain multi-MeV energy
                      electron bunches, whose energy and direction can be steered
                      by the combined effect of the induced near-field and the
                      laser field. We identified a two-step mechanism for the
                      electron acceleration: (i) ejection within a
                      sub-half-optical- cycle into the near-field from the target
                      at >TV/m acceleration fields, and (ii) subsequent
                      acceleration in vacuum by the intense laser field. Our
                      observations raise the prospect of isolating and controlling
                      relativistic attosecond electron bunches, and pave the way
                      for next generation electron and photon sources.},
      cin          = {JSC},
      ddc          = {600},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511)},
      pid          = {G:(DE-HGF)POF3-511},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31086214},
      UT           = {WOS:000467709100063},
      doi          = {10.1038/s41598-019-43635-3},
      url          = {https://juser.fz-juelich.de/record/862770},
}