• DOI:10.1103/PhysRevB.101.035115
• Corpus ID: 203642092

Photoemission spectrum of Ca2RuO4 : Spin polaron physics in an S=1 antiferromagnet with anisotropies

@article{Kosiski2019PhotoemissionSO,
  title={Photoemission spectrum of 
Ca2RuO4
: Spin polaron physics in an 
S=1
 antiferromagnet with anisotropies},
  author={Adam Kłosiński and D. V. Efremov and Jeroen van den Brink and Krzysztof Wohlfeld},
  journal={Physical Review B},
  year={2019}
}

• Adam Kłosiński, D. Efremov, +1 author K. Wohlfeld
• Published 4 October 2019
• Physics
• Physical Review B

We derive an S=1 spin polaron model which describes the motion of a single hole introduced into the S=1 spin antiferromagnetic ground state of Ca2RuO4. We solve the model using the self-consistent Born approximation and show that its hole spectral function qualitatively agrees with the experimentally observed high-binding energy part of the Ca2RuO4 photoemission spectrum. We explain the observed peculiarities of the photoemission spectrum by linking them to two anisotropies present in the employed model---the spin anisotropy and the hopping anisotropy. We verify that these anisotropies, and not the possible differences between the ruthenate (S=1) and the cuprate (S=1/2) spin polaron models, are responsible for the strong qualitative differences between the photoemission spectrum of Ca2RuO4 and of the undoped cuprates.