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Electronic excitations in the edge-shared relativistic Mott insulator: Na2IrO3

Beom Hyun Kim, G. Khaliullin, and B. I. Min
Phys. Rev. B 89, 081109(R) – Published 20 February 2014
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Abstract

We have investigated the excitation spectra of jeff=12 Mott insulator Na2IrO3. Taking into account a relativistic multiplet structure of Ir ions, we have calculated the optical conductivity σ(ω) and resonant inelastic x-ray scattering (RIXS) spectra, which manifest different features from those of a canonical jeff=12 system Sr2IrO4. Distinctly from the two-peak structure in Sr2IrO4, σ(ω) in Na2IrO3 has a broad single peak dominated by interband transitions from jeff=32 to 12. RIXS spectra exhibit the spin-orbit (SO) exciton that has a two-peak structure arising from the crystal-field effect, and the magnon peak at energies much lower than in Sr2IrO4. In addition, a small peak near the optical-absorption edge is found in RIXS spectra, originating from the coupling between the electron-hole (e-h) excitation and the SO exciton. Our findings corroborate the validity of the relativistic electronic structure and importance of both itinerant and local features in Na2IrO3.

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  • Received 1 July 2013
  • Revised 19 October 2013

DOI:https://doi.org/10.1103/PhysRevB.89.081109

©2014 American Physical Society

Authors & Affiliations

Beom Hyun Kim1,*, G. Khaliullin2,†, and B. I. Min1,‡

  • 1Department of Physics, PCTP, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 2Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

  • *bomisu@postech.ac.kr
  • g.khaliullin@fkf.mpg.de
  • bimin@postech.ac.kr

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Issue

Vol. 89, Iss. 8 — 15 February 2014

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