Abstract
We derive an spin polaron model which describes the motion of a single hole introduced into the spin antiferromagnetic ground state of . 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 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 () and the cuprate () spin polaron models, are responsible for the strong qualitative differences between the photoemission spectrum of and of the undoped cuprates.
- Received 11 October 2019
- Revised 20 December 2019
DOI:https://doi.org/10.1103/PhysRevB.101.035115
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