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Träfflista för sökning "WFRF:(Wahlstrom I.) "

Sökning: WFRF:(Wahlstrom I.)

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  • Bianchi, M., et al. (författare)
  • One-dimensional spin texture of Bi(441): Quantum spin Hall properties without a topological insulator
  • 2015
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 91:16
  • Tidskriftsartikel (refereegranskat)abstract
    • The high index (441) surface of bismuth has been studied using scanning tunneling microscopy (STM), angle resolved photoemission spectroscopy (APRES), and spin-resolved ARPES. The surface is strongly corrugated, exposing a regular array of (110)-like terraces. Two surface localized states are observed, both of which are linearly dispersing in one in-plane direction (k(x)), and dispersionless in the orthogonal in-plane direction (k(y)), and both of which have a Dirac-like crossing at k(x) = 0. Spin ARPES reveals a strong in-plane polarization, consistent with Rashba-like spin-orbit coupling. One state has a strong out-of-plane spin component, which matches with the miscut angle, suggesting its possible origin as an edge state. The electronic structure of Bi(441) has significant similarities with topological insulator surface states and is expected to support one-dimensional quantum spin Hall-like coupled spin-charge transport properties with inhibited backscattering, without requiring a topological insulator bulk.
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  • Ekvall, I, et al. (författare)
  • Preparation and characterization of electrochemically etched W tips for STM
  • 1999
  • Ingår i: MEASUREMENT SCIENCE & TECHNOLOGY. - : IOP PUBLISHING LTD. - 0957-0233. ; 10:1, s. 11-18
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We have investigated methods for cleaning de-etched polycrystalline tungsten tips for scanning tunnelling microscopy (STM). The cleaning methods include Ar-ion sputtering, heating, chemical treatments and Ne-ion self-sputtering. We correlate transmission
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  • Ferri, J., et al. (författare)
  • Enhancement of laser-driven ion acceleration in non-periodic nanostructured targets
  • 2020
  • Ingår i: Journal of Plasma Physics. - : Cambridge University Press (CUP). - 0022-3778 .- 1469-7807. ; 86:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Using particle-in-cell simulations, we demonstrate an improvement of the target-normal-sheath acceleration (TNSA) of protons in non-periodically nanostructured targets with micron-scale thickness. Compared to standard flat foils, an increase in the proton cutoff energy by up to a factor of two is observed in foils coated with nanocones or perforated with nanoholes. The latter nano-perforated foils yield the highest enhancement, which we show to be robust over a broad range of foil thicknesses and hole diameters. The improvement of TNSA performance results from more efficient hot-electron generation, caused by a more complex laser-electron interaction geometry and increased effective interaction area and duration. We show that TNSA is optimized for a nanohole distribution of relatively low areal density and that is not required to be periodic, thus relaxing the manufacturing constraints.
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  • Resultat 1-10 av 23

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