@article{13197,
  abstract     = {Nominally identical materials exchange net electric charge during contact through a mechanism that is still debated. ‘Mosaic models’, in which surfaces are presumed to consist of a random patchwork of microscopic donor/acceptor sites, offer an appealing explanation for this phenomenon. However, recent experiments have shown that global differences persist even between same-material samples, which the standard mosaic framework does not account for. Here, we expand the mosaic framework by incorporating global differences in the densities of donor/acceptor sites. We develop
an analytical model, backed by numerical simulations, that smoothly connects the global and deterministic charge transfer of different materials to the local and stochastic mosaic picture normally associated with identical materials. Going further, we extend our model to explain the effect of contact asymmetries during sliding, providing a plausible explanation for reversal of charging sign that has been observed experimentally.},
  author       = {Grosjean, Galien M and Waitukaitis, Scott R},
  issn         = {2475-9953},
  journal      = {Physical Review Materials},
  keywords     = {Physics and Astronomy (miscellaneous), General Materials Science},
  number       = {6},
  publisher    = {American Physical Society},
  title        = {{Asymmetries in triboelectric charging: Generalizing mosaic models to different-material samples and sliding contacts}},
  doi          = {10.1103/physrevmaterials.7.065601},
  volume       = {7},
  year         = {2023},
}

@article{8101,
  abstract     = {By rigorously accounting for mesoscale spatial correlations in donor/acceptor surface properties, we develop a scale-spanning model for same-material tribocharging. We find that mesoscale correlations affect not only the magnitude of charge transfer but also the fluctuations—suppressing otherwise overwhelming charge-transfer variability that is not observed experimentally. We furthermore propose a generic theoretical mechanism by which the mesoscale features might emerge, which is qualitatively consistent with other proposals in the literature.},
  author       = {Grosjean, Galien M and Wald, Sebastian and Sobarzo Ponce, Juan Carlos A and Waitukaitis, Scott R},
  issn         = {2475-9953},
  journal      = {Physical Review Materials},
  keywords     = {electric charge, tribocharging, soft matter, granular materials, polymers},
  number       = {8},
  publisher    = {American Physical Society},
  title        = {{Quantitatively consistent scale-spanning model for same-material tribocharging}},
  doi          = {10.1103/PhysRevMaterials.4.082602},
  volume       = {4},
  year         = {2020},
}

@article{19825,
  abstract     = {We study the electronic structure of delafossite PtCoO2 to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level despite the fact that it is formed mainly by Pt 𝑑 orbitals that are typically localized. We propose a picture based on two hidden kagome-lattice-like electronic structures: one originating from Pt 𝑠+𝑝𝑥/𝑝𝑦 orbitals, and the other from Pt 𝑑3⁢𝑧2−𝑟2+𝑑𝑥⁢𝑦/𝑑𝑥2−𝑦2 orbitals, each placed on the bonds of the triangular lattice. In particular, we find that the underlying Pt 𝑠+𝑝𝑥/𝑝𝑦 bands actually determine the steepness of the original dispersion, so that the large Fermi velocity can be attributed to the large width of the Pt 𝑠+𝑝𝑥/𝑝𝑦 band. In addition, the kagome-like electronic structure gives rise to “orbital-momentum locking” on the Fermi surface, which reduces the electron scattering by impurities. We conclude that the combination of the large Fermi velocity and the orbital-momentum locking is likely to be the origin of the extremely small resistivity in PtCoO2.},
  author       = {Usui, Hidetomo and Ochi, Masayuki and Kitamura, Sota and Oka, Takashi and Ogura, Daisuke and Rosner, Helge and Haverkort, Maurits W. and Sunko, Veronika and King, Philip D. C. and Mackenzie, Andrew P. and Kuroki, Kazuhiko},
  issn         = {2475-9953},
  journal      = {Physical Review Materials},
  number       = {4},
  publisher    = {American Physical Society},
  title        = {{Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2}},
  doi          = {10.1103/physrevmaterials.3.045002},
  volume       = {3},
  year         = {2019},
}