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

Adam Kłosiński, Dmitri V. Efremov, Jeroen van den Brink, and Krzysztof Wohlfeld
Phys. Rev. B 101, 035115 – Published 13 January 2020

Abstract

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=12) spin polaron models, are responsible for the strong qualitative differences between the photoemission spectrum of Ca2RuO4 and of the undoped cuprates.

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  • Received 11 October 2019
  • Revised 20 December 2019

DOI:https://doi.org/10.1103/PhysRevB.101.035115

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Adam Kłosiński1,*, Dmitri V. Efremov2, Jeroen van den Brink2,3, and Krzysztof Wohlfeld1

  • 1Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland
  • 2IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
  • 3Department of Physics, Technical University Dresden, Helmholtzstraße 10, 01069 Dresden, Germany

  • *adam.klosinski@fuw.edu.pl

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Vol. 101, Iss. 3 — 15 January 2020

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