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@ARTICLE{Seifert:1020242,
      author       = {Seifert, Tom S. and Go, Dongwook and Hayashi, Hiroki and
                      Rouzegar, Reza and Freimuth, Frank and Ando, Kazuya and
                      Mokrousov, Yuriy and Kampfrath, Tobias},
      title        = {{T}ime-domain observation of ballistic
                      orbital-angular-momentum currents with giant relaxation
                      length in tungsten},
      journal      = {Nature nanotechnology},
      volume       = {18},
      number       = {10},
      issn         = {1748-3387},
      address      = {London [u.a.]},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2023-05909},
      pages        = {1132 - 1138},
      year         = {2023},
      abstract     = {The emerging field of orbitronics exploits the electron
                      orbital momentum L. Compared to spin-polarized electrons, L
                      may allow the transfer of magnetic information with
                      considerably higher density over longer distances in more
                      materials. However, direct experimental observation of L
                      currents, their extended propagation lengths and their
                      conversion into charge currents has remained challenging.
                      Here, we optically trigger ultrafast angular-momentum
                      transport in Ni|W|SiO2 thin-film stacks. The resulting
                      terahertz charge-current bursts exhibit a marked delay and
                      width that grow linearly with the W thickness. We
                      consistently ascribe these observations to a ballistic L
                      current from Ni through W with a giant decay length
                      (~80 nm) and low velocity (~0.1 nm fs−1). At the
                      W/SiO2 interface, the L flow is efficiently converted into a
                      charge current by the inverse orbital Rashba–Edelstein
                      effect, consistent with ab initio calculations. Our findings
                      establish orbitronic materials with long-distance ballistic
                      L transport as possible candidates for future ultrafast
                      devices and an approach to discriminate Hall-like and
                      Rashba–Edelstein-like conversion processes.},
      cin          = {PGI-1 / IAS-1},
      ddc          = {600},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406},
      pnm          = {5211 - Topological Matter (POF4-521) / DFG project
                      437337265 - Spin+Optik: Theoretischer Entwurf von
                      antiferromagnetischer Optospintronik (A11) (437337265)},
      pid          = {G:(DE-HGF)POF4-5211 / G:(GEPRIS)437337265},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {37550573},
      UT           = {WOS:001043662300004},
      doi          = {10.1038/s41565-023-01470-8},
      url          = {https://juser.fz-juelich.de/record/1020242},
}