@article{SajediKrivenkovMarchenkoetal.2020,
  author    = {Sajedi, Maryam and Krivenkov, Maxim and Marchenko, Dmitry and Varykhalov, Andrei and Sanchez-Barriga, Jaime and Rienks, Emile D. L. and Rader, Oliver},
  title     = {Absence of a giant Rashba effect in the valence band of lead halide perovskites},
  series = {Physical review : B, Condensed matter and materials physics},
  volume    = {102},
  journal   = {Physical review : B, Condensed matter and materials physics},
  number    = {8},
  publisher = {American Institute of Physics; American Physical Society (APS)},
  address   = {Woodbury, NY},
  issn      = {2469-9950},
  doi       = {10.1103/PhysRevB.102.081116},
  pages     = {6},
  year      = {2020},
  abstract  = {For hybrid organic-inorganic as well as all-inorganic lead halide perovskites a Rashba effect has been invoked to explain the high efficiency in energy conversion by prohibiting direct recombination. Both a bulk and surface Rashba effect have been predicted. In the valence band of methylammonium (MA) lead bromide a Rashba effect has been reported by angle-resolved photoemission and circular dichroism with giant values of 7-11 eV angstrom. We present band dispersion measurements of MAPbBr(3) and spin-resolved photoemission of CsPbBr3 to show that a large Rashba effect detectable by photoemission or circular dichroism does not exist and cannot be the origin of the high effciency.},
  language  = {en}
}
@article{SajediKrivenkovMarchenkoetal.2022,
  author    = {Sajedi, Maryam and Krivenkov, Maxim and Marchenko, Dmitry and Sanchez-Barriga, Jaime and Chandran, Anoop K. and Varykhalov, Andrei and Rienks, Emile D. L. and Aguilera, Irene and Bl{\"u}gel, Stefan and Rader, Oliver},
  title     = {Is there a polaron signature in Angle-Resolved Photoemission of CsPbBr3?},
  series = {Physical review letters},
  volume    = {128},
  journal   = {Physical review letters},
  number    = {17},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {0031-9007},
  doi       = {10.1103/PhysRevLett.128.176405},
  pages     = {7},
  year      = {2022},
  abstract  = {The formation of large polarons has been proposed as reason for the high defect tolerance, low mobility, low charge carrier trapping, and low nonradiative recombination rates of lead halide perovskites. Recently, direct evidence for large-polaron formation has been reported from a 50\% effective mass enhancement in angle-resolved photoemission of CsPbBr3 over theory for the orthorhombic structure. We present in-depth band dispersion measurements of CsPbBr3 and GW calculations, which lead to similar effective masses at the valence band maximum of 0.203 1 0.016 m0 in experiment and 0.226 m0 in orthorhombic theory. We argue that the effective mass can be explained solely on the basis of electron-electron correlation and largepolaron formation cannot be concluded from photoemission data.},
  language  = {en}
}