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Sökning: WFRF:(Rønnow D.)

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  • Horio, M., et al. (författare)
  • Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca 2 RuO 4
  • 2023
  • Ingår i: Communications Physics. - 2399-3650. ; 6:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Doped Mott insulators are the starting point for interesting physics such as high temperature superconductivity and quantum spin liquids. For multi-band Mott insulators, orbital selective ground states have been envisioned. However, orbital selective metals and Mott insulators have been difficult to realize experimentally. Here we demonstrate by photoemission spectroscopy how Ca2RuO4, upon alkali-metal surface doping, develops a single-band metal skin. Our dynamical mean field theory calculations reveal that homogeneous electron doping of Ca2RuO4 results in a multi-band metal. All together, our results provide evidence for an orbital-selective Mott insulator breakdown, which is unachievable via simple electron doping. Supported by a cluster model and cluster perturbation theory calculations, we demonstrate a type of skin metal-insulator transition induced by surface dopants that orbital-selectively hybridize with the bulk Mott state and in turn produce coherent in-gap states.
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  • Rönnow, Daniel, et al. (författare)
  • Microwave complex permittivity and anisotropy of conifer wood chips vs moisture content: experiments and modeling
  • 2022
  • Ingår i: Journal of Wood Science. - : Springer. - 1435-0211 .- 1611-4663. ; 68:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The complex microwave permittivity-including anisotropy- of wood chips of softwood has been measured for different moisture contents in the band 0.75 to 2.5 GHz using an ultra-wide band radio transmission technique. The real and imaginary parts increase monotonically with moisture content. The wood chips are oriented by gravity, which gives anisotropic permittivity. The anisotropy ratio of the real part increases from 1.1 to 1.6 with moisture content from 0 to 120%. The anisotropy ratio of the imaginary part is around 2.5 at all moisture contents. Effective medium models were used to model the permittivity. The Bruggeman, and two versions of the Maxwell Garnett model gave good results at low moisture content (below the fiber saturation point). Above the fiber saturation point only the Bruggeman model gave results in agreement with experiments. The difference in model performance suggests that the free water does not follow the wood chips geometry.
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